The utility model discloses a water mist and ice preventing device for an outdoor camera lens. The device comprises a lantern ring, a micro hot air pump and a hot air ring pipe, wherein the lantern ring is sleeved on a lens of the camera, the hot air ring pipe is arranged on the inner wall of the lantern ring, the hot air ring pipe is connected with the micro hot air pump, the hot air ring pipe onthe inner wall of the lantern ring is provided with a plurality of air outlets, the micro hot air pump is arranged on a camera base, and the micro hot air pump is connected with a power supply of thecamera. During working, hot air generated by the micro hot air pump passes through the hot air ring pipe and is blown to the lens through the air outlet. According to the utility model, the lens of the outdoor camera is effectively prevented from water mist or icing, and the service life of equipment is prolonged.