The invention discloses a release agent spraying device used in the SG abrasive grain production process. The device solves the problems that in the prior art, bubbles are prone to be generated in anabrasive grain cavity during spraying of a release agent and the environment pollution is serious, and the device has the beneficial effects that the release agent can fully fill the abrasive grain cavity, and the air pollution is reduced. According to the scheme, the release agent spraying device used in the SG abrasive grain production process comprises a shell, opened holes used for allowing abelt mold to penetrate therethrough are formed on the two sides of the shell, at least one nozzle used for spraying the release agent to the belt mold is arranged in the shell, the shell is connectedwith an oil mist collection mechanism, the oil mist collection mechanism comprises a suction part arranged in an oil mist collection box body, and a filter layer is arranged at the part, on the side of the suction part, in the oil mist collection box body.