Coal bed gas double screw rod compressor unit

The invention relates to a coal seam gas twin-screw compressor set which is formed by connecting a plurality of compressors in parallel, wherein the compressors are provided with gas inlet pipes, the gas inlet pipes (12) of a first row of compressors (11-1) are communicated with a suction main pipe (1) of the compressor set through first-stage gas inlet piping (2), both sides of the first-stage gas inlet piping are symmetrically provided with second-stage gas inlet piping (3), and gas inlet pipes of a second row of compressors (11-2) are communicated with the suction main pipe (1) through the first-stage gas inlet piping and the second-stage gas inlet piping; the gas inlet pipes, the first-stage gas inlet piping, the second-stage gas inlet piping and the suction main pipe form an suction pipe system (10) of the compressor set, the suction pipe system is set by adopting a constant pressure drop method, and the caliber size of the second-stage gas inlet piping is equal to a square root of the sum of the square