Vehicle-mounted air conditioner with air deflector convenient to disassemble and assemble

The vehicle-mounted air conditioner comprises an air conditioner body and an air outlet cover, grooves are formed in the two sides of an air outlet of the air outlet cover, limiting grooves are formed in the upper groove wall and the lower groove wall of each groove, an air guide panel is further arranged at the air outlet of the air outlet cover, clamping blocks matched with the grooves are arranged on the two sides of the air guide panel, and the clamping blocks are matched with the limiting grooves. The clamping block is provided with a containing groove, and an adjustable fixing assembly is arranged in the containing groove. According to the air guide panel, the threaded sleeve is driven to rotate by rotating the shifting wheel, and the threaded sleeve rotates to drive the threaded inner rod in the threaded sleeve to be screwed out outwards or screwed in inwards under the limitation of the square block and the square through groove, so that the threaded inner rod drives the square block to enter or be sep