Zoom projector capable of being rapidly installed

The zoom projector comprises a zoom projector body, a circular box body and a metal cylinder, the outer side of the zoom projector body is sleeved with a protection frame, the top of the protection frame is fixedly provided with the circular box body through bolts, one end of the circular box body is connected with a pipe body through a threaded groove, and the other end of the circular box body is connected with the metal cylinder. A bolt rod is sleeved with the pipe body, an auxiliary pipe is installed in the circular box body through a bearing, the outer side of the auxiliary pipe is sleeved with a fluted disc through a flat key, the top end of the auxiliary pipe is sleeved with a telescopic main pipe, and an installation disc is welded to the top end of the main pipe. The ejector rod needs to be knocked to be inserted into the metal cylinder, the clamping teeth on the outer side of the metal cylinder are fully clamped with the threaded holes, and therefore the installation disc is fixed to the wall, repea