Rice is one of the largest planting area and highest yield grain crops in China, which is the largest country in rice planting area of the world, so growing rice is of great significance to ensuring national security and social stability . At present, China’s rice planting area is nearly five hundred million acres, and the mode of raising and transplanting seedlings is mostly adopted. Seeding is a key step in rice planting, so its mechanization level directly affects the production capacity of rice. Now the mechanization level of raising seedlings is still low and only about 10% in China, and there are many disadvantages, such as high labor intensity, uneven seeds sowed, low quality seedlings, low productivity and a large number of trays used . Therefore, to improve the comprehensive production capacity of rice and promote the rapid development of seedlings industrialization, it is imperative to realize the mechanization of raising seedlings