The utility model provides a swash light detector includes preceding shell, mesochite and laser pipe, preceding shell is connected with the front portion of mesochite, preceding shell, mesochite are the metal material, laser pipe sets up in preceding shell and space that the mesochite encloses, be equipped with the first insulation radiating piece between the laser guan yuqian shell, be equipped with second insulating radiation spare between laser pipe and the mesochite. The utility model discloses set up first insulation radiating piece, second insulating radiation spare, guaranteed the insulating radiation function that swash light detector is good.