A screw compressor, comprising: a first pressure level rotor assembly comprising a first pressure level male rotor and a first pressure level female rotor that mesh with each other; a second pressure level rotor assembly comprising a second pressure level male rotor and a second pressure level female rotor that mesh with each other; and a body in which the first pressure level rotor assembly and the second pressure level rotor assembly are arranged; wherein the first pressure level rotor assembly and the second pressure level rotor assembly are configured to enable an axial force received by the first pressure level rotor assembly and exerted by a compressed gas in the first pressure level rotor assembly opposite to an axial force received by the second pressure level rotor assembly and exerted by a compressed gas therein; further comprising: a motor disposed between the first pressure level rotor assembly and the second pressure level rotor assembly, wherein the motor comprises a motor shaft with a first end of the motor shaft in driving connection with the first pressure level male rotor, and a second end of the motor shaft in driving connection with the second pressure level male rotor and characterised in that a helix of the first pressure level male rotor has the same helical direction as a helix of the second pressure level male rotor, and the first pressure level female rotor and the second pressure level female rotor are respectively located on both sides of a shaft center line of the motor shaft. a first pressure level rotor assembly comprising a first pressure level male rotor and a first pressure level female rotor that mesh with each other; a second pressure level rotor assembly comprising a second pressure level male rotor and a second pressure level female rotor that mesh with each other; and a body in which the first pressure level rotor assembly and the second pressure level rotor assembly are arranged; wherein the first pressure level rotor assembly and the second pressure level rotor assembly are configured to enable an axial force received by the first pressure level rotor assembly and exerted by a compressed gas in the first pressure level rotor assembly opposite to an axial force received by the second pressure level rotor assembly and exerted by a compressed gas therein; further comprising: a motor disposed between the first pressure level rotor assembly and the second pressure level rotor assembly, wherein the motor comprises a motor shaft with a first end of the motor shaft in driving connection with the first pressure level male rotor, and a second end of the motor shaft in driving connection with the second pressure level male rotor and characterised in that a helix of the first pressure level male rotor has the same helical direction as a helix of the second pressure level male rotor, and the first pressure level female rotor and the second pressure level female rotor are respectively located on both sides of a shaft center line of the motor shaft. a motor disposed between the first pressure level rotor assembly and the second pressure level rotor assembly, wherein the motor comprises a motor shaft with a first end of the motor shaft in driving connection with the first pressure level male rotor, and a second end of the motor shaft in driving connection with the second pressure level male rotor and characterised in that a helix of the first pressure level male rotor has the same helical direction as a helix of the second pressure level male rotor, and the first pressure level female rotor and the second pressure level female rotor are respectively located on both sides of a shaft center line of the motor shaft.