The invention relates to a spring key switch structure which mainly comprises a light guide panel, a key, a pressure block, a printed circuit board, a support part, an annular spring and a sliding block. Pressure is applied to the key, and the sliding block is driven by the key through the pressure block to drive the annular spring to be displaced downwards, so that the annular spring is gradually expanded and deformed till forming contact with a conductive contact layer along the lower lateral surface of the annular groove to realize electric conduction; the pressure is removed, and the annular spring is separated from the conductive contact layer under the action of elastic force accumulated by expansion and deformation, and returns into an annular groove to realize electric disconnection. The spring key switch structure has the advantages of large travel, strong pressure, simplicity in assembling, high reliability, low contact resistance, long service life and the like, white light illumination, blue white light illumination or various light illumination compatible with night vision can be selected according to actual needs, and the capabilities of three proofing properties, dust prevention, waterproofness and the like of the spring key switch structure are higher than those of the conventional key switch.