The utility model relates to a cooling water spray nozzle of a parallel surface grinding machine. The double-end-face grinding machine solves the technical problem that an existing double-end-face grinding machine is insufficient in cooling and is provided with a water spray nozzle body and a baffle, the water spray nozzle body and the baffle form a liquid storage cavity, a plurality of gaps are formed in the front end of the water spray nozzle body and communicated with the liquid storage cavity, and the gaps are consistent with an object needing to be cooled in distance. The cooling device can be widely applied to cooling of the double-end-face grinding machine rotary disc with large heat productivity.