The invention discloses a high-efficiency multi-purpose air compressor. The high-efficiency multi-purpose air compressor comprises a base. Universal wheels are fixed to the outer wall of the bottom end of the base through screws. A turnbuckle is welded to one end of the outer wall of the top end of the base. An air tank is fixed to the base through the turnbuckle. A pressure sensor is fixed to theinner wall of the bottom end of the air tank through a screw. An air outlet is formed in the outer wall of the top end of the air tank. An air outlet pipe is welded to the inner wall of the air outlet. An electromagnetic valve is fixed to the outer wall of the air outlet pipe through a bolt. An air inlet is formed in the outer wall of one side of the air tank. A gas conveying pipe is welded to the inner wall of the air inlet. By additionally arranging a water tank additionally provided with a radiating fan and a condenser, the compressor can be radiated rapidly and effectively, the working efficiency of the compressor is improved, by additionally arranging two to four air outlet pipes on the air tank, a plurality of pneumatic tools can be connected simultaneously, thus, the working efficiency of the compressor can be improved, and the multiple pneumatic tools can be connected simultaneously.