The invention discloses an initial form construction method of self-supporting fracture. The method comprises the steps that A, a target reservoir rock is acquired, and processed as a cuboid rock plate, the rock plate is divided into two pieces along the direction perpendicular to the height, and A and B rough fracture surfaces are formed; B, surface topography data of A and B fracture surfaces iscollected, noise reduction and interpolation handling are conducted, and initial height matrices A0 and B0 are obtained; C, net value handling is conducted on the fracture surfaces, and net height matrices A1 and B1 are obtained; D, reverse handling is conducted on the fracture surfaces, and reverse height matrices A2 and B2 are obtained; E, dislocation handling is conducted on the fracture surfaces, and dislocation height matrices A3 and B3 are obtained; F, contact handling is conducted on the fracture surfaces, and contact height matrices A4 and B4 are obtained; G, A4 and B4 are used to plot, and an initial form of the self-supporting fracture is obtained. According to the initial form construction method of the self-supporting fracture, the initial shape of the self-supporting fractureof a target reservoir can be constructed, and an effective guidance for yield prediction and yield potential evaluation after hydraulic fracturing is provided.