Highway tunnel excavation supporting mechanism for hydraulic engineering construction

The highway tunnel excavation supporting mechanism for hydraulic engineering construction comprises a main body adjusting assembly and a branch operation assembly, and the branch operation assembly is arranged on the upper surface of the main body adjusting assembly; the main body adjusting assembly comprises a shell, a motor, a coupler, an L-shaped pipe, a pipe body, a rod body, a first through hole, a U-shaped plate, an air cylinder and a limiting block. A motor is installed on the inner side wall of the shell, a coupler is welded to an output shaft of the motor, and an L-shaped pipe is welded to the outer side wall of the coupler. The motor drives the L-shaped pipe to rotate through the coupler, so that angle adjustment can be carried out by connecting the supporting semicircular plate on the L-shaped pipe through the rod body and the pipe body, linkage can be carried out through the air cylinder arranged in the U-shaped plate, the application range is widened, and the applicability is effectively improved