The invention provides a trousers hook pegging device, which comprises a base and a cover board, wherein the base comprises a slope which is at an angle to a level, and a plane which is intersected with the slope, wherein a groove used for placing an upper piece of the trousers hook is arranged in a junction of the slope and the plane; the cover board is fixedly connected with the base, and the shape of the cover board is matched with the shape of the plane. The trousers hook pegging device has the advantages and the positive effects that the trousers hook pegging device has a simple structure, easy processing and convenient operation, so that the technological level requirements of a trousers hook pegging process on workers in the clothing industry are reduced; the trousers hook which is pegged by utilizing the device has high precision and low rejection rate.