Abstract: This paper deeply analyzes the importance of double cropping rice to ensure food security. In view of the low level of mechanized planting in the southern double cropping rice area, the small number of rice transplanters and the spread of manual direct seeding, this paper combs the restrictive factors of the development of double cropping rice planting mechanization in the south from five aspects of stubble connection, growth period, comparative benefit, technical difficulty and production scale, through comprehensive evaluation and experimental demonstration, the advantages of three mechanized planting technologies, i.e. large bowl blanket seedling mechanized seedling raising, rice mechanized orderly throwing, and rice bowl seedling placement, in alleviating stubble contradiction, resisting natural disasters, reducing pesticide application, and increasing rice yield, were compared in depth, and the suitable mechanized planting technology mode for Southern double cropping rice was selected. The corresponding measures and suggestions are put forward from the aspects of technology promotion, policy support and socialized service, to speed up the improvement of the mechanization level of double cropping rice planting in the South and promote the recovery of double cropping rice area by selecting suitable main promotion technologies according to local conditions, improving the whole process mechanization technology mode, increasing the number of rice planting machines and tools, improving the layout of seedling breeding centers, and improving the service capacity of seedling planting.