Push plate backpressure control system and compression garbage truck

The invention discloses a push plate backpressure control system and a compression garbage truck. The push plate backpressure control system comprises a control loop, a push plate oil cylinder and a sliding plate oil cylinder. A piston in the push plate oil cylinder divides the interior of the push plate oil cylinder into a first push plate oil cavity and a second push plate oil cavity, and a piston in the sliding plate oil cylinder divides the interior of the sliding plate oil cylinder into a first sliding plate oil cavity and a second sliding plate oil cavity. The control loop comprises an oil inlet pipeline, an oil return pipeline, a first branch and a second branch, the first branch is provided with a first overflow valve, the second branch is provided with a second overflow valve and an electromagnetic valve, and the first branch and the second branch are connected to the control loop in parallel. According to the technical scheme, the control loop controls connection or disconnection of an oil way where