Pressure-drop testing device of high-pressure well

The utility model relates to a pressure-drop testing device of a high-pressure well, comprising a plug (1), a connecting cap (2) and a wellhead short joint (3) which are in threaded connection, wherein two inner screw threads (7) are arranged in the plug (1), and are respectively in threaded connection with a well-programmed pressure meter; and the wellhead short joint (3) is provided with an emptying gate (5). The pressure-drop testing device is used for testing pressure drop of the high-pressure well in a low-permeability oil field and has the advantages that the pressure resistance is 35Mpa, so that the problem that the pressure-resistance index in the conventional well-testing blowout prevention is not enough is solved, and the construction safety factor is increased; the pressure-drop testing device is short, so that the transportation is convenient; and the parts are fewer, the connection is convenient and reliable, the operation can be finished by one person, and the construction efficiency is improved.