Anchor rod mounting device and operation arm

The invention discloses an anchor rod mounting device and an operation arm, an anchor rod comprises a rod body with external threads and a fastening nut arranged on the rod body in a penetrating and sleeving mode, and the anchor rod mounting device comprises a tensioning element, a first power mechanism, a second power mechanism, a locking element and a third power mechanism. Wherein the tensioning element is provided with a connecting part which is provided with an internal thread and is used for connecting the rod body; the first power mechanism is used for driving the tensioning element to rotate so as to be connected with the rod body; the second power mechanism is used for driving the tensioning element to move in the axial direction and exerting prestress on the anchor rod. The locking element is of a hollow tubular structure, coaxially sleeves the tensioning element in a penetrating manner, and is provided with a joint part used for being connected with the fastening nut in a sleeving manner; and the d