Abstract: Aiming at problems of high egg picking strength, low efficiency, high breakage rate and high cost, combined with current status of relative low degree of automation and mechanization of related devices in China, a fully automatic egg collection device for multi-layer chicken cages was designed and developed． The device could realize full automation of egg collection, transfer and cartoning of multi-layer chicken cages．Design idea, overall structure and working principle of each part of automatic egg collection device was expounded, and key structures such as egg trough output door device and stepped egg drop device were tested．Overall structure of automatic egg collection device was analyzed by UG software modeling．Multi-index orthogonal test was carried out by making a prototype．Experimental results determined that optimal design parameters of key devices of machine were that, speed of trolley was 9 cm/s, distance between lift gates was 15 cm, and horizontal angle of stepped landing device was 60°．Under optimal design parameters, egg collection efficiency of fully automatic egg collection integrated device of multi-layer chicken cage was 2250 eggs per hour, and the egg non-breakage rate was 99.7%, which was 50% higher than that of manual egg collection．