Double-male pup joint for acid fracturing

The invention discloses a double-male pup joint for acid fracturing. The double-male pup joint comprises a body and a main runner arranged on the body, and further comprises a pressure tapping opening, a first acid-proof rubber layer, a first sealing ring, a second acid-proof rubber layer, a second sealing ring, a pressure sensor, a liquid injection opening, and a liquid injection channel, whereinthe pressure tapping opening is formed in the body and penetrates through the side wall of the main runner; the first acid-proof rubber layer is arranged at a first opening, located on the outer wallsurface of the side wall of the main runner, of the pressure tapping opening and blocks the first opening; the first sealing ring is arranged between the body and the first acid-proof rubber layer; the second acid-proof rubber layer is arranged at a second opening, located in the inner wall surface of the side wall of the main runner, of the pressure tapping opening and blocks the second opening,and a gap is formed betwee