The production technology of hollow plastic ball is divided into three categories, the first category is blow technology production, is also the most popular hollow plastic ball production technology, the second category is composed of two semicircular hollow spheres by ultrasonic welding, but suitable for ultrasonic welding technology of plastic materials only a few, second kinds of technology in the production of plastic toys the hollow ball, Tangjiao technology has very high selectivity to the plastic material, only suitable for PVC plastic raw materials to production, more than three kinds of technology for the production of hollow plastic ball, the most difficult is the production of plastic ball ultrasonic technology, ultrasonic technology for semi circular plastic ball is strictly selective, it has a high precision of semicircular plastic the ball, there is the production of plastic hollow sphere ultrasonic technology high requirements for raw materials, only several materials can use ultrasound technology for producing hollow plastic ball.