The invention provides an automatic stamping device. The automatic stamping device belongs to the technical field of stamping equipment. The automatic stamping device comprises a housing body providedwith a paper inlet and a paper outlet. A supporting mechanism is arranged on the lower portion of the inner side of the housing, and a stamping mechanism is arranged above the supporting mechanism. The supporting mechanism includes an imprinting platform. Both sides of the imprinting platform are correspondingly provided with a paper feeding roller and a paper discharging roller, and the imprinting platform is arranged on the housing body through a first guiding column and can be moved up and down. The bottom of the imprinting platform and the inner bottom wall of the housing are provided with a first spring, and the first spring is sleeved on the first guiding column. The automatic stamping device can ensure the effect of stamping and prolong the service life; the angle of the paper feeding board can be adjusted conveniently and is suitable for papers of different specifications; the seal adopts the structure of quick disassembly and assembly, and is convenient to replace, so that the working efficiency is improved.