Abstract: Aiming at existing leafy vegetable seeder to cover soil seeder, each casting only sowing planting tray one row, one planting tray needs to be seeded many times, production efficiency is low, and can not realize planting agronomy of soilless seedling, a new type of fully automatic air suction leafy vegetable precision seeder with soilless cultivation sponge tray as seeding object was designed．Equipment adopted modularized design, and one-time action process could complete whole tray leafy vegetables seeding operation．Design calculation and seeding experiment confirmed that conveyor belt roller diameter was 73 mm, conveying speed was 0.27 m/s, and conveying motor power was 370 W, which could meet seeder conveying demand for planting trays．Rodless cylinder with a cylinder diameter of 25 mm could meet flat thrust demand required by transpotation device, and standard cylinder with 63 mm cylinder diameter could meet thrust demand for vertical movement of negative pressure chamber during seeding．Vacuum degree was 22 kPa, flow rate 270 m³/h vacuum pump could meet negative pressure chamber suction nozzle on seed adsorption force needs．When diameter of suction nozzle was 1 mm, missed sowing rate and replanting rate are at a low level．Through-hole needle structure could effectively avoid suction nozzle clogging caused by decline in seeding problem efficiency, reduce seeder operation failure and to ensure equipment operation stability．