The invention discloses a heavy oil thermal recovery casing pipe testing device, belonging to wellhead control mechanical equipment. The testing device comprises a casing pipe, an assisting rod, a pressurization pipeline, a loading device, a heating device, a displacement sensor, a thermocouple, a leak collecting device and an internal pressure sensor, wherein the leak collecting device is arranged on the outer surface of a coupling of the casing pipe, the casing pipe is connected with the loading device by the assisting rod, the internal pressure sensor is connected with the pressurization pipeline by the assisting rod, the heating device is wrapped on the surface of the casing pipe, the two ends of the displacement sensor are fixed at the two ends of the casing pipe by fixing devices, and the thermocouple is fixed on the casing pipe by a hose clamp. With the adoption of the mode of repeated temperature rising and dropping, the testing device can effectively simulate the true situation of the service of the casing pipe in a heavy oil thermal recovery well and can perform accurate evaluation on the applicability of the casing pipe.