The invention discloses a compressor and an air cylinder. The compressor comprises a compression mechanism. The compression mechanism comprises the air cylinder, an upper bearing, a lower bearing and a crankshaft. The upper bearing and the lower bearing are arranged on the two end faces of the air cylinder correspondingly. The crankshaft is arranged in the air cylinder in a penetrating mode and supported by the upper bearing and the lower bearing. The crankshaft is provided with an eccentric part which is sleeved with a piston. The air cylinder is made of a metal strip. The metal strip is selected and manufactured into the air cylinder, the weight of the air cylinder can be reduced, and the machining cost of the air cylinder can be lowered. In addition, the metal strip has the characteristics of high strength, high rigidity and high elasticity modulus, deformation of the air cylinder in the assembly process can be avoided further, and changes of the gap of a sliding sheet slot in the operating process of the compressor can be avoided; and accordingly, the strength of the air cylinder can be improved, and the performance of the compressor can be improved.