The invention belongs to the technical field of tennis teaching and training auxiliary devices, and discloses a novel tennis trainer with a waste ball. The novel tennis trainer comprises a ball body. The two sides of the ball body are each provided with a long opening which is about 1.5 inches long through scratching. A transverse rod is inserted and the skin layers of the scratched waste ball are fastened by fastening devices at the two ends of the transverse rod. One end of a tension spring is connected with the transverse rod, and the other end of the tension spring is connected with a bearing. A drag hook and a rubber belt are installed on a supporting frame. The trainer is hung at any height of a tennis court guard net through the drag hook and the rubber belt and installed on a wall through an expansion bolt. Training of twenty-four different types of techniques like forehand/backhand up-spin batting, down-spin cutting, intercepting and flat stroke at upper/middle/lower different heights can be conducted; waste volleyball, basketball, football and the like are adopted as the ball body, waste is turned into wealth, and the material is easy to obtain; the supporting frame can be installed on the tennis court guard net, the height is freely adjusted, and trainees freely take action strengthening training; the trainer is not limited by field; quite visual spinning can be realized through the soft ball body and the tension spring.