The invention discloses a split air foil bearing easy to disassemble and an air compressor with the same. The split air foil bearing mainly comprises a radial bearing and a thrust bearing. The radial bearing comprises a bearing sleeve, radial bump foil and radial top foil, wherein the bearing sleeve, the radial bump foil and the radial top foil are coaxially arranged in sequence from outside to inside. The thrust bearing comprises a thrust disc, thrust bump foil and thrust top foil, wherein the thrust disc, the thrust bump foil and the thrust top foil are arranged in sequence from left to right. The air compressor mainly comprises a turbine, a nut, a rotor sleeve, the radial bearing, the thrust bearing, a turbine end bearing body, a motor base, an impeller end bearing body and a rotor shaft. According to the air compressor, by adopting the split air foil bearing easy to disassemble for supporting, the problem that frequent disassembly of a traditional air compressor influences dynamic balance of a rotor is well solved, the maintenance cycle can be shortened, and the maintenance cost can be lowered; by adopting the air dynamic pressure bearing for supporting, compared with the traditional air compressor, no hydraulic system is needed, the system is simpler, the cost is lower, and higher stability is achieved in high-speed operation.