The invention relates to a ball cup with a ball head coupler, which is matched with a coupling ball head for use. The ball cup comprises a coupling seat body provided with a coupling hole, and a ball cup body connected with the coupling seat body, wherein a hollow cavity is arranged on the ball cup body, and the hollow cavity is provided with a spherical face which is in matching contact with a coupling ball head. The ball cup is characterized in that one side of the ball cup body is provided with a positioning member extending into the hollow cavity of the ball cup body, the positioning member is in contact with the spherical face of the coupling ball head, and the coupling ball head is limited in the hollow cavity of the ball cup body; the ball cup body corresponding to the other side of the positioning member is provided with a regulating member extending into the hollow cavity of the ball cup body, and the regulating member can be matched with the positioning member after the outer spherical surface of the ball cup changes so as to regulate and keep the working position of the coupling ball head in the hollow cavity of the ball cup body. The invention has the advantages of simple structure, low cost, convenience for operation, high working stability and long service life.