The invention discloses a variable valve lift driving device, and relates to an engine component which is invented to prolong the service lives of parts and reduce the machining cost and fuel consumption of an engine. The variable valve lift driving device comprises a valve, a valve connecting rod, a valve rocker and a camshaft, a swing arm and a swing arm adjusting frame are arranged between the valve rocker and the camshaft, a first rotating center and a second rotating center are arranged on the swing arm, a first pin and a second pin are connected onto the swing arm adjusting frame, the first rotating center is coaxial with the first pin and connected with the first pin, the second pin is fixed, the camshaft drives the swing arm to swing around the first rotating center when rotating to drive the valve connecting rod to linearly reciprocate, so that the valve is opened or closed, and the swing arm adjusting frame drives the swing arm to rotate around the second rotating center to adjust the position of the first rotating center when rotating around the second pin. The variable valve lift driving device is mainly applicable to the engine.