Novel negative pressure fan capable of being rapidly installed

The utility model discloses a novel negative pressure fan capable of being rapidly installed, and relates to the technical field of negative pressure fans. The negative pressure fan comprises an installation frame, the installation frame is movably connected with a negative pressure fan body, two installation cavities are formed in the installation frame, the installation frame is rotationally connected with a rotating rod, the rear end of the rotating rod is located in the installation cavities and fixedly connected with a driving gear, and the driving gear is meshed with a driven gear. The surface, away from the driving gear, of the driven gear is fixedly connected with a threaded rod, the threaded rod is in threaded connection with a moving cylinder, moving grooves are formed in the left side face and the right side face of the negative-pressure fan body, and the moving cylinder is slidably connected with the moving grooves. The rotating rod is matched with the driving gear and the driven gear to drive the