Silent oil-free portable air compressor is low noise, oil-free and environment-friendly. The pump head is thickened and has an integrated design, which has less vibration and stronger pressure bearing capacity. It strengthens the curved cylinder head and increases the heat dissipation effect of the surface area. The pure copper motor starts well, the temperature rise is low, and the output is more stable. The exhaust of high-end solenoid valve is more flowing, and the motor starts without resistance.