The utility model belongs to the technical field of the immersible pump check out test set, relate to immersible pump positioner on overhead tank cover, including the overhead tank cover, the downside of fixed vertical mounting panel is provided with the layer board on the cover bottom surface, immersible pump positioning fixture and cylinder drive lateral shifting are used for shutoff immersible pump oil pocket to detect the end cap that connects, be provided with air vent and sensor or the external sensor detection line that has analog quantity pressure switch on the end cap, the middle part of cover is provided with the cylinder drive and reciprocates the end cap that is used for shutoff latent water pump motor chamber detection to connect, be provided with the sealed latch segment of cable conductor draw -in groove and cable conductor on the lateral wall of cover, the advantage is: through the immersible pump positioning fixture with immersible pump location on the cover, the dismouting immersible pump and removing the immersible pump to jar body inside and outside be convenient for utilizes the cable conductor draw -in groove sealed to cause jar external by the jar is internal the cable conductor of immersible pump, reduces and detects the error, is applicable to the immersible pump and detects and use the overhead tank.