Abstract: Agricultural mechanization is an important material basis for improving agricultural productivity and an important support for comprehensively promoting implementation of Rural Revitalization Strategy.It has played an important role in increasing grain yield and reducing losses.Important role and significance of increasing grain yield and reducing losses brought by agricultural mechanization were combed systematically.Promotion potential and key technologies of mechanization promoting grain production increase and loss reduction were analyzed deeply.Achievements of mechanization in promoting grain production increase and loss reduction were summarized.Suggestions for potential factors and weaknesses were put forward.