The utility model provides a projector mounting rack. The projector mounting rack comprises a mounting base; the angle adjuster is rotationally arranged on the mounting base; the supporting platform is rotationally arranged on the angle adjuster; and the projector mounting plate is obliquely arranged on the supporting platform. According to the utility model, accurate and comprehensive pose adjustment can be carried out on the projector through the plurality of adjustable joints, the installation problem of the projector in projection screen construction is solved, the pose adjustment of the projector is facilitated, distortion and deformation of images projected by the projector are reduced, and the watching quality of films is improved.