Single-phase frequency conversion air compressor

The invention discloses a single-phase frequency conversion air compressor. A machine head is fixed into a horizontal type oil separation barrel, the horizontal type oil separation barrel and the bottom of a main motor are fixed to an installing plate, and the installing plate is fixed to the bottom of the inner side of a protection support; the machine head comprises a male rotor, a female rotorand a shell, the male rotor and the female rotor are parallel and are meshed, the male rotor and the female rotor are located in the shell, and the two ends of the male rotor and the two ends of the female rotor are rotationally connected with the shell through bearings; the male rotor comprises spiral teeth, the female rotor comprises spiral grooves, the spiral grooves and the spiral teeth move relatively to form a volume-variable volume cavity, a main belt wheel is fixed to the output end of the main motor, and an auxiliary belt wheel is fixed to one end of the male rotor; and a frequency conversion speed regulating