The invention discloses an injection mold of a motor wind wheel. The injection mold comprises a movable mold body, a fixed mold body and slider mechanisms, wherein each slider mechanism is provided with a small slider, a wedge and an inclined guiding column and further provided with a large slider. A sliding channel is arranged in each large slider. Each wedge is placed in the corresponding sliding channel. Each large slider is provided with a through hole for the corresponding inclined guiding column to penetrate. A large rotary table rotating around the movable mold body is arranged below the fixed mold body and provided with a plurality of strip-shaped arc grooves extending from interior to exterior. The strip-shaped arc grooves are correspondingly formed in the positions below the large sliders in a one-to-one manner. Each large slider is fixedly provided with a connecting rod pin stretching into the corresponding strip-shaped arc groove. A rotation driving device driving the above large rotary table to rotate is arranged outside the fixed mold body. Compared with the prior art, one part of the overall demolding power source of the slider mechanisms of the injection mold is finished through the inclined guiding columns, the other part of the overall demolding power source of the slider mechanisms of the injection mold is finished through cooperation of the large rotary table and the large sliders, the inclined guiding columns do not serve as the power source for overall demolding of the slider mechanisms, the length of the inclined guiding columns is greatly reduced, the overall strength of the inclined guiding columns is high, and fracture due to stress is not likely to happen.