A permanent magnet synchronous high-speed dry oil-free screw air compressor is disclosed. The compressor includes a compressor body, an inlet box and an outlet box. The inlet end of the compressor body is fixed with an inlet box by bolts. The inlet box is fixed with a filter plate by a slot. The filter plate and the inlet box are glued with an sealing pad. The inner part of the filter plate is embedded with an electric heating pipe. The outer side of the electric heating pipe is fitted with a thermal pad. The top and bottom ends of the filter box are fixed with a frame by bolts. The structure frame is provided with a dust filter net. The present invention can filter and dehumidify the inlet air, and has the function of noise reduction, which is suitable for wide promotion and use.