Connecting structure facilitating gap adjustment of coupling of long-shaft pump

A connecting structure facilitating gap adjustment of a coupling of a long-shaft pump comprises a lifting pipe and a bent pipe, the upper end of the lifting pipe is connected with the bent pipe, a pump shaft is arranged in the lifting pipe, a mounting seat is arranged at the upper end of the bent pipe, a mounting opening is machined in the middle of the mounting seat, a bearing box is mounted at the mounting opening, and a pump shaft motor is mounted on the mounting seat. The upper end of the pump shaft penetrates through the bearing box and is connected with the output end of the pump shaft motor through a coupler, an adjusting seat is arranged at the installation opening, a through hole is formed in the middle of the adjusting seat, installation holes are machined in the periphery of the adjusting seat, the bearing box is connected to the adjusting seat, the adjusting seat comprises a base, and a plurality of adjusting cushion blocks are arranged above the base. The adjusting cushion block is used for contr