The invention discloses a detection device for fire valve processing, which relates to the technical field of fire valve processing. The detection device for fire valve processing includes a detectiondevice body. The front bottom of the detection device body is fixedly connected with a first support plate. The front of the detection device body above the first support plate is fixedly connected with a second support plate. The upper surface of the first support plate and the bottom of the second support plate are fixedly connected with ball bearings. The inner walls of the ball bearings are fixedly connected with a threaded rod. The surface of the threaded rod is in threaded connection with a lifting block. According to the detection device for fire valve processing, four second support rods can stretch or tighten to clamp fire valves with different diameter sizes easily, and therefore, the problem that the detection devices for fire valve processing on the existing market are not universal as different detection devices are needed to detect valves with different diameter sizes is solved.