The invention discloses an environment exhaust gas controllable high-temperature thermal fatigue testing machine which comprises a direct current heater, a sample clamp and a gas heater; the sample clamp is placed on a base plate; the base plate is fixed to an insulating plate with a cushion block through a bolt, and the base plate and the insulating plate are located on the same height; a baffleon the sample clamp can control the motion distance through a movable clamping plate; a fixing screw is fixed between the sample clamp and a baffle on the base plate; a thermocouple sensor can sense the temperature of a sample on the sample clamp; exhaust gas can pass through the gas heater and flow on the surface of the sample through a gas guiding tube; a counter for recording the cooling frequency is arranged on the heater; a temperature controller is connected with the thermocouple sensor; the working steps applied to a thermal fatigue testing sample machine can be controlled by the temperature controller. The machine is simple in structure, reasonable in design and capable of adjusting a restraint coefficient during high-temperature fatigue, and meanwhile simulating the exhaust gas environment. The testing device is simple in structure, reasonable in design and capable of executing automobile high-temperature section thermal fatigue tests.