An automatic leveling method for 3D print includes: acquiring three-dimensional coordinate values of one reference point and four compensation points of a print platform; constructing a reference plane and a fitting plane according to the reference plane and the four compensation points; calculating a compensation value of the fitting plane with respect to the reference plane; and adjusting the height of a z axis of a print head according to the compensation value so as to perform printing. The automatic leveling method can effectively reduce errors of 3D print.