In order to optimize the structural parameters of automatic suction cup feeding device in egg processing line, as well as to fix the sync location of the key parts in prototype installation, a structural analysis and movement simulation was made for the core part of this device，i.e., combined suction cup swing arm mechanism. Results indicated as follows: the DOF (degree of freedom) of suction cup swing arm combination which were made up of crank, gears and timing belts in series was 1. The crank was in full rotation, rocker was reciprocating and swinging at 60°, swing arm was reciprocating and swinging at 180°;the synchronization had the angular compensation in order that suction cup parts would always be in the horizontal state when the swing arm was swinging at 180° so as to guarantee horizontal handling and transport of eggs. The curve change of swing arm end displacement, velocity as well as acceleration indicated that when the rocker swung to the accessories where the extreme position angles were 146° and 206°, swing arm had a vertical up-and-down motion whose horizontal speed was 0, respectively corresponding to crank 84°~108° and 252°~312°, in order to ensure vertical movement of suction cup in process of sucking and putting down the eggs. In order to ensure the synchronous and coordinated motion of this device, when carrying out the prototype installation, the crank must be at 96°, the rocker arm should be at 146°, and the swing arm should be at 174°. The prototype testing indicated that the theoretical analysis and simulation results were in good accordance with the measured value.