In the present invention, in the mass flow meter and pressure control method for an air compressor from which energy flow is derived, in particular, by installing an internal pressure sensor and a temperature sensor in a pipeline through which the fluid flows, the flow rate of the fluid flowing through the pipeline can be accurately and accurately measured. It relates to a mass flow meter and a pressure control method for an air compressor, characterized in that the energy flow rate is derived, Measurement unit 10 and the temperature and pressure of the fluid flowing in the pipe line; A calculation unit 20 for calculating the mass flow rate of the fluid using the value measured by the measurement unit 10; It is characterized in that it comprises an output unit 30 for outputting the result calculated by the operation unit 20.
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