Simple oil well casing string pressure testing device

The utility model discloses a simple oil well casing string pressure testing device which comprises a pipe body. One end of the pipe body is sealed, and threads are formed on the inner wall of the other end of the pipe body. A pressure testing pump interface, a pressure sensor interface and a pressure relief interface which are communicated with the inside of the pipe body are sequentially arranged on one side of the pipe body up and down. Through an external pressure testing pump and a pressure testing recorder, the simple oil well casing string pressure testing device can accurately measure and indicate the pressure variation inside an oil well casing string and the condition of sealing with pressure. The conditions that an oil well casing head and a double male joint are wrong buckled and can not test pressure in mounting and pressure testing are avoided, technicists can find abnormal sealing of the oil well casing string at an early period, so that measures are taken timely, well completion period is shortened, and the waiting and halting time of a drilling machine is shortened.