The invention discloses a single-shot multi-receiving area scanning type laser detecting device assembled on a non-rotating projectile. An annular opening is arranged in the casing of a bullet. The annular opening is covered by an annular transparent lens, and the annular transparent lens is fixed on the casing. A partition plate is fixed in the bullet and is located above a fuse. A driving motoris fixed on the partition plate through a motor bracket. A transmitting scanning reflection plane mirror is fixed on the output shaft of the driving motor. The transmitting scanning reflection plane mirror is equal to the annular transparent lens in height. A laser emitter is fixed on a laser emitting circuit, and the laser emitter and the laser emitting circuit are electrically connected. M receiving lenses are distributed circumferentially along the outer wall of the projectile body with uniform spacing. A photodetector is fixed on a laser receiving circuit. An inductive magnetic sheet is embedded in a motor shaft. A magnetoelectricity sensor is embedded in the inner wall of the casing and faces the inductive magnetic sheet to detect the target azimuth information. A main control circuitis fixed on the top face of the partition plate of the projectile. The device provided by the invention is for the problems of unavailable multi-shot multi-receiving small-caliber projectile and complicated structure of a single-shot single-receiving structure scheme.