The invention relates to gas yield simulation of shale gas under indoor quick water effects of petroleum industry, and in particular relates to a shale gas well yield simulation tester under a quick water effect. The tester comprises a gas source supply system, a gas pressurization storage system, a constant temperature measurement simulation testing system and a quick water injection system which are sequentially connected onto a pipeline in series, wherein the constant temperature measurement simulation testing system is positioned in a thermostat; the thermostat is controlled to operate by a control cabinet with a PLC (programmable logic controller) control chip; and a vacuumizzing system is connected on a pipeline between the gas pressurization storage system and the constant temperature measurement simulation testing system through a bypass pipe a. Due to the structure, the tester disclosed by the invention has the advantages that the yield simulation result is obtained by simple calculation, the yield simulation precision is high, and the simulation cycle is short.