The utility model relates to the fine-tuning and clearance-free wear-resistant screw-nut pair of projection equipment, which is characterized by comprising a metal screw and a nut member arranged on the screw. The nut member comprises a plastic outer jacket and a metal nut. The metal nut is fixed in the plastic outer jacket and is threadedly connected with the metal screw. The plastic outer jacket is provided with a through hole designed for the screw to pass through and in interference fit with the screw. According to the technical scheme of the utility model, the fine-tuning and clearance-free wear-resistant screw-nut pair is simple in structure and reasonable in design. The problem in the prior art that a large clearance exists in a conventional screw-nut pair can be overcome. Meanwhile, the small stress problem of conventional plastic nuts is also solved. Therefore, the service life of the nut member can be prolonged.