The invention discloses a gas channeling simulation system, which includes a cement slurry unit, a gas supply unit, a heating unit and a test unit. The cement slurry unit communicates with the test unit and provides cement used for test; the gas supply unit communicates with the test unit and used for providing pre-set pressure used for tests; the test unit is arranged in the heating unit, which is used for providing preset temperature used for test; the test unit comprises a gas channeling pipe used for measuring the gas channeling process of cement and a weight loss pipe used for measuring the pressure of a cement hydrostatic column; the gas channeling pipe and the weight loss pipe are located in a heating cylinder and are provided with an annular chamber used for accommodating cement, and the bottom ends of the gas channeling pipe and the weight loss pipe are provided with pressure detection mechanisms, respectively; the bottom end of the annular chamber of the gas channeling pipe is provided with a first cement slurry input port and a first gas input port, and the top end of the gas channeling pipe is provided with a pressurization detection port; and the bottom end of the annular chamber of the weight loss pipe is provided with a second cement slurry input port.