Manipulator mechanism for underwater clamping and using method thereof

The manipulator mechanism comprises a fixing frame, and the upper portion of the front end of the fixing frame is connected with an upper left mechanical arm and an upper right mechanical arm through an upper left-right transverse moving mechanism; a lower left-right transverse moving mechanism, a lower left mechanical arm and a lower right mechanical arm are symmetrically arranged on the lower portion of the front end of the fixing frame, the upper left-right transverse moving mechanism, the upper left mechanical arm and the upper right mechanical arm. The left mechanical arm is connected with a row of left transposition units, the right mechanical arm is connected with a row of right transposition units, the multiple left transposition units and the multiple right transposition units are arranged at intervals in the front-back horizontal direction, and the left transposition units and the right transposition units are the same in number and are alternately arranged in the front-back direction. A left rope i