A CONICAL SHAPE SINGLE ROTOR COMPRESSOR is used for compressing the fluid such as air, gas or refrigerant. It comprises a conical shape Rotor placed horizontally in the taper housing which is stationery part of the compressor. The said rotor is mounted between fixed bearing at discharge end and detachable bearing at suction end of the rotor shaft for smooth operation.The rotor further consisting of helical grooves for compressing the fluid from high volume of fluid to low volume of fluid which develops a high pressure at discharge end of rotor. The inlet pipe is provided for sucking the fluid through the housing get connected between the helical grooves on the rotor ,whereas the high pressure fluid is going out for the application through the discharge pipe and the compressor efficiency is enhanced with smooth operation and less maintenance.