Abstract: The new development concept of "innovation, coordination, green, openness and sharing" is the centralized reflection of China's development concept, direction and focus in the 14th Five-Year Plan and even in the longer term. The green development of agriculture is an important part of the implementation of the new development concept, which plays an important role in forming a harmonious coexistence between human beings and nature, ensuring food safety and creating a livable environment. Fertilizer, as the largest exogenous input and production material, plays a significant role and has a profound impact on the quantity and quality of agricultural products and the agricultural ecological environment, and plays a pivotal role in the green development of agriculture. However, the improper application of traditional fertilizers has caused the degradation of soil quality, environmental pollution and degradation of agricultural products, which urgently requires the transformation and upgrading of fertilizer products, and the development of green inputs has come into being. Green fertilizer concept and definition: the application of quality and safety of raw materials, low-carbon environmental protection process, the use of physical - chemical - biological modification and efficiency technology production and use, with efficient and balanced nutrients, emission reduction and environmental protection, fertilization of fertile soil function of a class of fertilizers. Types of green fertilizers are mainly divided into the following five categories: Nutrient-efficient green fertilizers; Carbon-fixing and fertilizing green fertilizers; Efficiency-enhancing and nutrient conversion efficiency green fertilizers; Nutrient-balanced green fertilizers; Value-added green fertilizers. How to realize the green transformation of chemical fertilizers and the efficient and low-cost utilization of organic fertilizer resources, there are four main suggestions. (1) Rely on market mechanisms, strengthen top-level design, and build a new system of green fertilizer manufacturing; (2) Take the integrated management of nutrient resources as the core, and promote the balanced and coordinated development of organic-mass-element-micro-element fertilizers; (3) Fully play the role of scientific research platforms, and greatly develop intelligent green fertilizer products; (4) Integrate modern sensing and information technology to thoroughly promote green and efficient precision fertilization. This paper provides an overview of the background, concept, types and characteristics of green fertilizers proposed, and discusses the future development direction, in order to provide insight into the green transformation of China's fertilizer industry and the green development of agriculture in the future.

Key words: green fertilizer, nutrition balance, soil fertility improving, environmental friendly