Air inlet valve for integrated variable-frequency screw air compressor

The invention relates to an air compressor part, in particular to an air inlet valve for an integrated variable-frequency screw air compressor, and the air inlet valve solves the use problem of air inlet valves. The air inlet valve comprises an outer valve body, a fixed valve body, a check-valve lever, a piston and a sealing top, wherein a regulating cavity is arranged in the outer valve body; a mounting cavity for allowing the sealing top, the piston and the fixed valve rod to fill in sequence is arranged on the lower part of the outer valve body; a gas exhaust access hole is formed in the outer wall of the upper part of the outer valve body; the gas exhaust access hole, the regulating cavity and the mounting cavity are sequentially in communication; the check-valve lever is arranged in the regulating cavity; the gas exhaust access hole and the regulating cavity are shielded and blocked by moving the check-valve lever; a movable cavity is formed between the sealing top and the fixed valve body; the piston is