Hydraulic system of garbage squeezer

The invention discloses a hydraulic system of a garbage squeezer, and aims to solve the problems that the garbage squeezer is complex to operate, a lifting cylinder and a squeezing cylinder do not move synchronously, and pressure is easy to release in the garbage squeezing and pressure maintaining process. The hydraulic system is composed of a main pump, a high-pressure overflow valve, an electro-hydraulic directional control valve, a balance valve, a speed regulating valve, a two-position two-way electromagnetic directional valve, a hydraulic lock, a pilot valve set, a pilot pump, a low-pressure overflow valve, a one-way valve, a lifting cylinder, a pressing cylinder and other hydraulic elements. The hydraulic system is characterized by being composed of a main oil way and a pilot oil way, the main oil way controls the two lifting cylinders and the two pressing cylinders to move synchronously through the synchronous loop; and the working principle is as follows, the pilot valve grouphandle is operated to con