The invention discloses an automatic check sealing device. The automatic check sealing device comprises an inkpad adding device, a check conveying device, a seal, a fixed piece, a spring, a connecting base, a connecting piece 1, a connecting piece 2, a connecting rod 1, a screw rod 1, a guide rail, a nut base 1, a fixed base, a nut base 2, a connecting rod 2, a screw rod 2 and a motor 1. The inkpad adding device comprises an inkpad adding shell, a screw rod 3, a motor 2, a movable plate, an inkpad groove and a nut base 3. The automatic check sealing device is reasonable and simple in structure, low in production cost and convenient in installation; firstly, checks are flatly put on the bottom surface of a placing groove; a fan is provided for effectively guaranteeing absorption of the check on the bottom surface of the placing groove, so that no influence on the checks in movement of a placing plate is guaranteed; then, a motor 4 drives the placing plate to move to the left side, so that the checks are shifted to the lower side of the seal; a scanner can firstly scan the checks to achieve observation by remote workers for determination; and then, the next operation is performed to improve the sealing safety.