Soft rock tunnel excavation structure

The invention discloses a soft rock tunnel excavation structure, and relates to the technical field of excavation structures, according to the technical scheme, the soft rock tunnel excavation structure comprises a structure main body, a water storage tank and a mounting seat, a tunneling head is arranged on one side of a rotating column, a speed regulating mechanism is arranged on the inner side of the structure main body, and the speed regulating mechanism comprises a motor, a rotating rod and a second gear; a water flow conveying mechanism is arranged on the inner side of the water storage tank and comprises a conveying device, a first guide pipe and a second guide pipe, a through hole is formed in the outer portion of the tunneling head, a movable block is arranged on the outer portion of the fixing rod, and a buffering mechanism is arranged on one side of the movable block and comprises a spring and a damper. According to the device, meshing operation between the gears is controlled through the motor, th