Downhole tool testing device

The utility model discloses a downhole tool testing device, and belongs to the technical field of oil exploitation machinery. The downhole tool testing device comprises a testing shaft, a lining pipe,a conversion connector, a plurality of positioning pins, a first sealing body, a second sealing body and a first pressing ring. According to the device, the lining pipe can be mounted in a test wellbore without machining threads at the pipe orifice of the lining pipe, so that the strength of the lining pipe is ensured. Besides, after the conversion connector and the lining pipe are placed into the bearing section of the test well together, the sealing section and the supporting end of the test shaft can be sealed through the first sealing body, the first pressing ring and the second sealing body, and therefore the sealing performance of the test shaft is not affected. Moreover, no component connected in an air-tight threaded connection manner is arranged in the device, so that no specialequipment is needed during