Abstract: Tray used repeatedly after the necessary cleaning can be used again.Cleaning methods mainly include physical cleaning，chemical cleaning and electronic cleaning.Pressure cleaning is the world recognized as the most scientific，economic and environmentally friendly cleaning method.SDQXJ-Ⅰtype tunnel tray cleaning machine was designed.This machine is a specialized seedling tray cleaning equipment using pressure cleaning method.Design scheme，working principle and relevant parameters calculation were introduced and test verification was made.