The invention discloses an automatic stamping device for a check. The automatic stamping device comprises an inkpad adding device, a check conveying device, a stamp, a fixing part, a spring, a connecting base, a first connecting part, a second connecting part, a first connecting rod, a first screw, a guide rail, a first nut seat, a fixing base, a second nut seat, a second connecting rod, a second screw and a first motor. The automatic stamping device has the advantages that the structure is reasonable and simple, the production cost is low, the installation is convenient, firstly, the check is flatly placed on the bottom surface of a placement groove, a fan is arranged so that the check can be effectively guaranteed to be adsorbed on the bottom surface of the placement groove, no influence on the check can be caused when a placement plate moves, then a fourth motor drives the placement plate to move leftwards to enable the check to move to the lower side of the stamp, a scanner can scan the check first so that a remote person can watch the check conveniently, the next operation can be carried out after determination, the stamping operation is carried out inside so that the possibility that the check is likely to be replaced can be avoided, and the safety in the stamping process can be improved.