The invention provides a comprehensive detecting device and method for airtightness of a torque converter housing, and the device is characterized by comprising the following parts of a bed support; aprotection part fixedly connected to the bed support; a torque converter housing conveying mechanism set in an accommodating space formed by the protection part and the bed support, and used for conveying a torque converter housing to be detected; a torque converter housing plugging mechanism matched with the torque converter housing conveying mechanism for plugging, wherein the torque converterhousing plugging mechanism comprises a plurality of plugging members used for plugging the torque converter housing to be detected to form a chamber to be detected; and a control cabinet, respectivelyconnected to the torque converter housing conveying mechanism and the torque converter housing plugging mechanism and comprising a leak tester, wherein solenoid valves are arranged on all the test circuits formed by the leak tester and corresponding plugging members. The technical solution of the invention is not only small in floor space and compact in structure, but also convenient in use, highin production efficiency, stable and reliable in test quality, and high in the degree of intelligence.