The invention discloses a three-dimensional shape dynamic measurement method based on an active spot projector. The method comprises the steps of S100, fabricating an active spot projector, S200, carrying out global calibration on multiple measuring heads, S300, acquiring speckle images projected by a speckle projector to the surface of a moving object by using the multiple measuring heads, S400, carrying out three-dimensional reconstruction for the surface of the moving object, and S500, carrying out point cloud global alignment. The method disclosed by the invention is high in measurement speed, can complete acquisition of image data within two milliseconds, realizes a single time of measurement for general moving objects, and can also realize multiple times of dynamic measurement for a rotating object at the measuring heads. The method does not need to carry out spraying treatment on the object surface and is high in anti-interference for the ambient light, and measurement is not affected by the external light intensity.