The invention discloses a transformer winding drying constant pressure device, which includes a base, a platform lifting hole, a transmission cavity, a first lever device, a second lever device, an extrusion plate, an extrusion chute, a return spring, a winding platform and a winding shaft. The base is arranged in a circular shape, the platform lifting hole is set in the center of the base, the transmission cavity is set in the base, the return spring is vertically set in the center of the transmission cavity, and the winding platform is set in the platform lifting hole , the winding shaft is set on the winding platform, the extrusion chute is fixed on the upper wall of the base, the extrusion plate is slidably set on the extrusion chute, and the first lever device is set on the transmission space In the cavity, the second lever device is arranged above the base and outside the extrusion plate. The invention belongs to the technical field of transformer production, and specifically provides a transformer winding drying constant voltage device with tight clamping, continuous and constant clamping force, simple operation, high safety, high practicability, easy movement and low cost.