The invention discloses a true triaxial test method for the similar material solid-gas energy coupling law. The test method comprises the following steps: connecting a mainframe of a triaxial permeability test device, a hydraulic system, a PLC program control system, a displacement sensor, a power source, an air compressor, a balance tank, an SL8-02 single fine-tuning throttle valve, an air inlet sieve plate, an MF5700 gas mass flow meter, an acoustic emission sensor and an acoustic emission signal acquisition instrument; coating the manufactured test piece with 704 sealing silicone rubber, placing the test piece into a platform cabinet, and using a sealant to seal the test piece and the air inlet sieve plate, so as to ensure the gas tightness during the whole process of gas passing the test piece for conducting the test. The test method for the first time realizes the integrated requirements of triaxial compression complete stress-strain of the similar material test piece, gas permeability, the energy test and the synchronization test, and the permeability and energy dissipation law of the similar material test piece under the triaxial stress condition is obtained.