The invention provides an automatic packing system for a split meal box. The automatic packing system comprises a rotating disc device and a press fit device, wherein the rotating disc device comprises a rotating disc body and a rotating disc drive used for driving the rotating disc body, a plurality of positioning structures are arranged on the rotating disc body at intervals, a single lower boxor a lower box with an upper box buckled is positioned in the positioning structures, the press fit device comprises a pressing mold and a first linear driving mechanism, the pressing mold is locatedabove the rotating disc body, the pressing mold comprises a mold cavity and a pressing edge formed at the edge of the opening of the mold cavity, a mover end of the first linear driving mechanism is connected with the mold cavity so as to drive the pressing mold to move vertically downwards, so that the pressing edge presses a connecting edge between the upper box and the lower box which are buckled towards the inner side for deformation so as to seal the upper box and the lower box. Automatic buckling and automatic box sealing of the split meal box can be achieved, the efficiency is high, andthe quality is easier to guarantee; furthermore, transfer of the upper box and the lower box among different stations is achieved through ingenious structure combination, the structure is reliable, and the deformation of the meal box in the transfer process can be avoided.