To provide an automatic box stamping device which realizes the automation of an operation by automatically conveying and stamping stacked boxes deviated alternately from each other.

This automatic box stamping device comprises a supply part 2 which causes the ascent of the lids 1 of stacked boxes deviated alternately, suction parts 8A, 8B which are provided above the supply part 2 in a direction in which the lids 1 are conveyed and ascend alternately to suck the uppermost lid 1, belt conveyors 28, 28 which convey the stamped lids 1 upto a stacking part 4 through a stamping part 3 for stamping the lids 1 from the suction parts 8A, 8B, stoppers 41A, 41B for distribution which are provided on the stacking part 4 and adjust a stop position for the tip of the lid 1 in a forward/backward direction, stacking pushers 42A, 42B which causes the ascent of the lids 1 stopped by the stoppers 41A, 41B by tilting the lids 1 alternately, and a stocking part 5 which is provided above the stacking pushers 42A, 42B and retains the stacked lids 1 deviated from each other alternately.