The invention provides a cloth pressing device for a sewing machine, belongs to the technical field of machines and solves the problem that the space occupied by the existing cloth clamping mechanism is large. The cloth pressing device for thesewing machine comprises an L-shaped supporting plate, wherein the supporting plate comprises a vertically arranged supporting part and a horizontally arranged connecting part, a notch which penetrates through the front and rear side surfaces of the connecting part is formed in the end portion of the connecting part, a pressing plate is arranged in the notch, a threaded hole is formed in the lower side surface of the connecting part, a screw is connected into the threaded hole, the upper end of the screw is fixed with the pressing plate, a positioning plate is fixedly arranged on the upper side surface of the connecting part, a notch groove which penetrates through the left and right side surfaces of the positioning plate is formed in the positioning plate, a guide plate in parallel with the positioning plate is arranged on the positioning plate, a convex pressing pillar is arranged on the lower side surface of the guide plate, and a guide part which is slidably connected with the guide plate is arranged on the supporting plate. The cloth pressing device further comprises a driving part which can drive the guide plate to move up and down, and the driving part is fixed with the supporting part. The cloth pressing device for the sewing machine has the advantage of small occupied space.