The work aims to design an integrated machine based on automatic fruit screening, grading and packaging, so as to solve the problems of high labor intensity, low efficiency and high probability of damage to the peel found in the existing grading and packaging equipment. The fruit was transported into the cup by the feeding device and rotated for 360° through the cooperation of the gear and rack. After screening, a special punching die diverting device was used for diversion. After the fruit was delivered to the packaging machine, the 45DF cam divider was used together with the motor-driven ratchet to realize the secondary single diversion, and the physical characteristics of the foamed plastic mesh were used to realize the automation of single fruit packaging through the rapid return characteristics of the cam. Based on mechanical principle and mechanical design, the calculation design and simulation design of key components were carried out. The results showed that the installation angle between the conveyor and the ground was 3°, the maximum deformation of the conveyor tray was 0.503 69 mm, the maximum deformation of the ratchet was 5.763 9×10−5 mm, the maximum strain was 4.799×10−7, and the maximum stress was 9.56×10−4 N, which met the use requirements. The realization of automation of the grading and packaging integrated machine reduces labor force, lowers the labor cost and improves the economic benefit.