The invention provides a plate glass cache device, which can solve the problems that a horizontal spacing storage way has large plane space and high operating cost. The technical scheme of the invention is as follows: the structure comprises a frame mechanism for storing plate glass and a servo mechanism of a racking, wherein the frame mechanism comprises a storing framework with degree of freedom of vertical movement and a vertical movement driving mechanism of the storing framework; and the plate glass at the bottom of the storing framework is transported to a servo system, and the structure members and assembly are arranged in a box-shaped casing. The cache device of the invention has simple structure, strong practical applicability and low operating cost.