The invention discloses a reconstruction method for a three-dimensional human body dynamic form. The reconstruction method for the three-dimensional human body dynamic form comprises the steps that 1, background subtraction is performed on a t-moment image to obtain a human body contour image; 2, all body blocks in a three-dimensional space are scanned, and whether central points of all the body blocks are points on the three-dimensional form are detected through a projection lookup table; 3, three-dimensional space points in the three-dimensional form are removed; 4, color rendering is performed on form epidermal points by using a color average value of corresponding two-dimensional pixel points of a visual camera image, and finally the t-moment three-dimensional human body form with the color is obtained. The invention further discloses a reconstruction method for a three-dimensional movement light stream. The reconstruction method for the three-dimensional movement light stream comprises the steps that 1, Jocobian light stream lookup table calculation is performed on the central points of all the body blocks in advance; 2, a three-dimensional light stream is calculated; 3, a noise light stream caused by noise is removed to obtain the three-dimensional movement light stream of the whole form. The fast reconstruction method for the three-dimensional human body dynamic form and the reconstruction method for the three-dimensional movement light stream have the advantages of being convenient and fast, high in precision and easy to implement.