Smoke instrument capable of adjusting light incident angle

The utility model provides a smoke dust instrument capable of adjusting a light incident angle, which comprises a case, a laser transmitter, a transmitting cylinder, a base, an adjusting gear, a gear adjuster, a knob, a light hole, a receiving lens seat and a laser receiver, the case is a sealed case, and the laser transmitter, the base, the adjusting gear, the gear adjuster and the laser receiver are all arranged in the case; one end of the knob is arranged on the outer side of the case, the other end of the knob penetrates through the side of the case, is arranged in the case and connected with one end of the gear adjuster, the other end of the gear adjuster is connected with the adjusting gear, the top of the adjusting gear is fixedly connected with the bottom of the base, and the laser transmitter is fixedly arranged at the top of the base. The laser transmitter comprises a transmitting head, the laser receiver comprises a receiving lens, the transmitting head and the receiving lens are opposite to the sa