Telescopic lever auxiliary supporting clamp device

The invention discloses a telescopic lever auxiliary supporting clamp device. The device comprises a clamping bottom plate (9) and a push-pull power source (5), wherein the push-pull power source is connected with a sliding component (8), a transverse main supporting rod (6) is installed on the sliding component, and a longitudinal auxiliary supporting rod (3) is installed at a longitudinal position of the transverse main supporting rod; and the longitudinal auxiliary supporting rod is connected with an auxiliary supporting power source (1). After the workpiece is clamped and limited, an outerend of the transverse main supporting rod is located below a to-be-machined part of the workpiece and abuts against the to-be-machined part of the workpiece, and the other end of the transverse mainsupporting rod is locked and fixed through the longitudinal auxiliary supporting rod. When the workpiece is machined, the phenomena of machining cutter vibration, deformation and the like caused by suspension of the machined p