The utility model provides a pressing device for a glass kiln. The pressing device comprises a fixed supporting seat, a step bolt, a baffle ring, a spring and an insulating pressing structure, one endof the step bolt is a large-diameter end, the other end of the step bolt is a small-diameter end, and the outer surface of the small-diameter end is smooth without threads. The step bolt is fixedly connected to the fixed supporting base through the large-diameter end, and the small-diameter end is sequentially sleeved with the baffle ring, the spring and the insulating pressing structure. The diameter of a central hole of the baffle ring is smaller than that of the large-diameter end; and the insulating pressing structure is used for contacting and jacking the refractory brick structure of the glass kiln. The device can be automatically adjusted in a telescopic manner, so that the refractory brick structure of the glass kiln continuously expands or contracts under certain pressure in thewhole expansion and contraction process, and uninterrupted expansion adjustment is realized.