The invention discloses a detection device suitable for water temperature sensors. The detection device comprises an operating floor, a fixing plate, an air cylinder, an upper detection plate, a lower detection plate, detection probes, a bearing plate and a controller. The detection device is characterized in that the operating floor is disposed on supports, positioning plates are provided with positioning blocks, the fixing plate is disposed on vertical columns, the upper detection plate is disposed on a piston rod, the lower detection plate is disposed between the positioning plates, and two ends of the bearing plate are respectively disposed in positioning grooves. The two ends of the bearing plate with bearing holes are disposed in the positioning grooves, and the water temperature sensors needing to be detected are disposed in the bearing holes, so stability of the water temperature sensor during detection is improved, and the water temperature sensor after the detection can be taken down with the bearing plate from the detection device; and the number of the water temperature sensors in one-time detection is improved, operators' labor intensity is reduced, and detection efficiency of water temperature sensing is improved.