The invention discloses a gas well fracturing liquid discharging system and method. The gas well fracturing liquid discharging system achieves integrated ground procedures of coiled tubing hydraulic sand blasting perforation, multistage fracturing, packing, forward and reverse sand flushing and liquid discharging in the process of gas well fracturing, and is designed for achieving a coiled tubinghydraulic sand blasting perforation annulus fracturing sand-filling packing multistage-fracturing technology. The method mainly comprises a coiled tubing hydraulic sand blasting perforation procedure,a coiled tubing and sleeve annulus injection fracturing procedure, a coiled tubing forward and reverse sand flushing procedure and a ground liquid discharging procedure. According to the gas well fracturing liquid discharging system and method, under the premise that safety of gas well fracturing operation can be ensured, the procedures of coiled tubing hydraulic sand blasting perforation, oil jacket annulus injection fracturing, forward and reverse circulating sand flushing, open flow liquid discharging and the like can be achieved, so that multi-stage fracturing construction of a gas fieldvertical well or a horizontal well is completed, the construction efficiency can be effectively improved, and the operation cost is reduced.