The invention discloses an oil-free piston, a processing technology thereof and a piston compressor. The processing technology of the oil-free piston comprises the following steps that through pressing and forming a ring body of the piston, the structural strength of the ring body is relatively high, so that high temperature resistance and friction resistance are better; through processing the inner wall of the ring body, interference fit of the inner wall of the ring body and the appearance of the piston is formed, and thus the connection between the inner wall of the ring body and the appearance of the piston can be closer; through thermal expansion, the piston can be sleeved into the ring body easily, and after cooling, the ring body can tighten the piston; through the arrangement of gluing, the bonding strength of the ring body is higher, and thus the piston is not prone to falling off, and the service life of the piston is prolonged; and through reheating, the piston, the ring body and a glue layer are integrated, the glue is cured, and thus the purpose of more stable bonding is achieved. Through cutting and drilling of the outer surface, the piston can be adapted to the size of a cylinder; according to the oil-free piston, the ring body is not prone to falling off, and the structural strength of the ring body is high, so that the service life of the piston is high, and as well, the service life of the piston compressor is prolonged.