The invention discloses a screw connecting device for an automobile interior decoration part. The screw connecting device comprises a screw, a buckle part and an elastic rib, wherein the buckle part comprises a clamping cylinder and inverted parts symmetrically arranged on the two sides of the clamping cylinder, and the clamping cylinder is connected with the inverted parts on the two sides; and the elastic rib is arranged on the inverted parts. Through the design of the specific clamping part, the corner part, the elastic rib and the clamping cylinder part, the clamping force and the anti-disengaging friction force can be achieved, the sliding of an inserting column can be prevented, the target product can be firmly fixed, the fixing mode of the traditional metal screw nut is completely changed, the fixing mode of the automobile interior part is simplified, and the target workpiece can be quickly fixed without an auxiliary tool.