The utility model provides a dust -protection type motor that dispels heat fast, including the casing, the casing is hollow and the open tube structure in both ends, and the end cover is installed to the first end of casing, and the windy fan cover of casing second end installation is equipped with a plurality of first bar openings that are parallel to each other on the casing, the outside cover of casing is equipped with the dust cover, is equipped with a plurality of second bar openings that are parallel to each other on the dust cover, reserve gapped formation annular cooling chamber between casing and the dust cover, the annular cooling intracavity is equipped with condenser tube, and condenser tube arranges around casing axis spiral that condenser tube is equipped with water inlet and delivery port, is equipped with first through -hole, second through -hole respectively with water inlet, the corresponding position of delivery port on the dust cover. The utility model discloses set up condenser tube between casing and dust cover, heat dissipating and cooling effect is good, and can not take place the seepage of water, and effectively to avoid electrical inside produces high temperature, and the heat that produces in the motor work can directly exhale, need not other auxiliary device and dispels the heat.