The invention provides a method for preventing a cylindrical part from an edge turning up defect in a rotary pressing process. The method is characterized in that some blanks of a port part of the cylindrical part are reserved and avoid deformation during rotatably pressing the blank of the cylindrical part. According to the method, a mode of reserving few blanks of the port part of the cylindrical part and avoiding deformation is proposed to solve the problem that the port part of a part is easily subjected to edge turning up defect in the rotary pressing process of the cylindrical part; an area subjected to rotary pressing deformation bears axial limitation force from two sides, and thus the edge turning up defect can be avoided.