The invention provides a device for fixing stand pipe monitoring equipment. The device comprises a clamp, a connecting piece and a locking piece. The monitoring equipment is arranged on the clamp. Theclamp is provided with an opening which can allow the clamp to be clamped on a stand pipe. One end of the connecting piece is rotationally connected with one end of the opening. The other end of theconnecting piece is connected with the other end of the opening through the locking piece in a locked mode to lock the two ends of the opening of the clamp. By arranging the monitoring equipment on the clamp, the clamp is clamped on the stand pipe firstly, and thus primary fixing between the clamp and the stand pipe is achieved; one end of the opening of the clamp is rotationally connected with the connecting piece, and the other end of the connecting piece is connected with the other end of the opening of the clamp through the locking piece in the locked mode, so that the two ends of the opening of the clamp are connected in a locked mode, and secondary fixing between the clamp and the stand pipe is achieved; and an operation method is simple, mounting and demounting are facilitated, underwater mounting and recovery can be achieved, and high connecting reliability is achieved.