An anti-surge system for compressors is provided. A compressor for compressing the fluid; a first pipe connected to the inlet of the compressor; a first valve controlling the flow rate of the first pipe; a second pipe connected to the outlet of the compressor; A second valve which is provided at an end of the second pipe and opens at a first pressure or more of the fluid in the second pipe, a fluid which is connected to the first valve at the second pipe, And a check valve provided on the bypass line and opened in the direction of the first valve from the second pipe at a second pressure higher than the first pressure and provided on the bypass line, It opens when the flow rate of the bypass line increases and closes when the flow rate of the bypass line decreases.
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