Hot-cold compact test device for automobile exhaust pipe

A hot-cold compact test device for an automobile exhaust pipe comprises a hot air general pipe, a cold air general pipe and a cold-hot compact pipe connected with the automobile exhaust pipe, wherein the hot air general pipe is connected with two hot air branches through a three-way joint, the cold air general pipe is connected with two cold air branches through a three-way joint, the cold-hot compact pipe are connected with the hot air branch and a cold air branch, each hot air branch and each cold air branch are provided with a valve sheet, and air valves for controlling the opening and closing of the valve sheets are arranged outside each hot air branch and each cold air branch. When the test device carries out a cold-hot compact test, a hot source and a cold source can be used for carrying out hot-cold compact test on two exhaust pipes, thereby shortening test time and saves test resources. The hot-cold compact test device is convenient for installation and use, and excellent in durability.