The utility model discloses an assembling mechanism of a raise boring machine grabbing rod mechanical arm. The assembling mechanism of the raise boring machine grabbing rod mechanical arm comprises a mounting rack (1) which is used for assembling the mechanical arm. The mounting rack is connected on a main rack (8). An inclined arm (3) of the mechanical arm adopts a symmetrical structure. The inclined arm is hinged on the mounting rack. The mounting rack and the inclined arm are hinged with an inclined oil cylinder (2). A rotating arm (4) is hinged with the inclined arm, the rotating arm and the inclined arm are hinged with a rotating oil cylinder (7), a clamping jaw arm (6) is hinged with the rotating arm, and the clamping jaw arm and the rotating arm are hinged with a clamping oil cylinder (5). Compared with the prior art, the assembling mechanism of the mechanical arm adopts a symmetric-type inclined arm structure and achieves a universal type that the mechanical arm can be assembled and used at two sides, so that the construction environment of a raise boring machine is not limited any more, manpower and material resources when a drilling machine operates are saved, and the progress of the whole works is accelerated.