Fixing support for installing central air conditioner

The utility model discloses a fixing support for installing a central air conditioner, which comprises a fixing plate, a first screw hole, a distance adjusting assembly, an angle adjusting assembly, a shaft sleeve, a first rotating shaft, a support, a first sliding groove, an installing frame, a second screw hole, an installing box, a second rotating shaft, a thread, a worm gear, a lead screw, a first sliding block, a connecting plate, a knob, a second sliding groove, an installing plate and a second sliding block. Threads are symmetrically formed in the outer wall of one side of the second rotating shaft, worm wheels are connected to the outer walls of one sides of the threads in a meshed mode, a rotary knob is arranged on one side of the mounting box, and the rotary knob is fixedly connected to the outer wall of one side of the second rotating shaft. The distance between the installation frames can be adjusted so as to adapt to central air conditioners of different brands and specifications, the angle adjus