The utility model provides a laser radar with inside wind channel, including base, dustcoat, motor and rotor, the inclosed cavity of formation is connected in base and dustcoat cooperation, motor androtor all set up in the cavity, and the motor sets up on the base, and the rotor is connected with the motor, and the motor can drive rotor rotary motion, the rotor is cylindric structure, and the rotor has top surface, bottom surface, medial surface and the lateral surface relative with the top surface, is equipped with heat radiation structure on at least one face in lateral surface and the medial surface. The utility model discloses laser radar is equipped with heat radiation structure at rotor lateral surface or medial surface for forced convection takes place at the inside air of operation in -process for laser radar, and the inside heat that produces can produce the circulation flow under the effect in the external world, and in time disperses the inside heat of radar through the dustcoat, avoids local high temperature to burn out the subassembly, thus better improvement laser radar's radiating efficiency and performance.