The invention discloses a novel mechanical arm which comprises a base, landing legs, a protective fence, a hydraulic rod and sliding wheels. The landing legs are installed at the bottom end of the base, the protective fence is installed at the edge of the bottom end of the base, a fence door is installed at one end of the protective fence, a vertical rod is installed at the middle portion of the top end of the base, a transverse arm is installed at the top end of the vertical rod, a balance weight is installed at one end of the transverse arm, the other end of the transverse arm is provided with a mechanical arm body, and a hook is installed at one end of the mechanical arm body; and an operation panel is installed on one side of the mechanical arm body, upper and lower operation buttons are installed on one side of the operation panel, grooves are formed inside the landing legs, hydraulic rods are installed inside the grooves, and the sliding wheels are installed at one ends of the hydraulic rods. The novel mechanical arm is convenient to move and high in stability during work; and meanwhile, the good safeguard procedures are taken, the potential safety hazard happening probability is reduced, and the mechanical arm is protected.