The invention provides a glass compressing device and belongs to the technical field of glass processing. The glass compressing device comprises a butterfly spring, a cam, a pressure plate, a pull rod and a pull ring. A supporting shaft is slidably arranged on a supporting shaft sleeve up and down; the upper end of the butterfly spring fits an upper ring seat while the lower end of the butterfly spring fits a spring supporting nut; a round ring is rotatably arranged on a clamp body through a ball; a round top on the lower end of an adjusting screw fits the end surface of the cam; an elastic pressure head is mounted on the right end of the pressure plate; a cone-shaped lifting pin is slidably arranged in a lifting pin groove; a reset spring is also mounted in the lifting pin groove; the left end of the reset spring fits the lifting pin groove; the right end of the reset spring fits the cone-shaped lifting pin; a pressure pad is arranged on the upper end of a supporting platform; a rotary disc is rotatably arranged on a rotary disc support; the pull rod is vertically mounted on the rotary disc; and the upper end of the pull rod is inserted into the pull ring. The glass compressing device provided by the invention not only can quickly compress glass, but also plays a role of preventing an excessive clamping force, so that the glass is effectively prevented from being broken.