The invention belongs to the technical field of aviation engines, and relates to a titanium alloy combustion test device and a test method thereof. The test device includes a combustion chamber, a fiber laser, a gas supply pipe, an exhaust pipe, a gas cylinder set, a mass flow controller, a check valve, a gas heater, an intake valve, a pressure control valve, an exhaust valve, a camera, and an infrared temperature sensor, a pressure sensor, a thermocouples, a sample heating device, a sample holder, a computer and the like. The gas cylinder set is used as a gas source, the gas heater heats thegas, the mass flow controller and the pressure control valve control the pressure in the combustion chamber, the sample heating device heats a sample, the fiber laser ignites the sample, a titanium alloy material/component combustion test with simulation conditions of a gas temperature to be 500 to 600 DEG C, the pressure to be 1.0 to 1.5 MPa and the sample temperature to be 600 to 900 DEG C can be realized, a computer program is adopted to control the test parameters such as the ignition time, and the test precision is higher. The test device has a compact structure, the mounting is convenient, the test cost is low, the urgent needs for aircraft engine titanium alloy combustion characteristic evaluation at preset and in the future can be met, and the application prospect is wide.