The invention provides a hydraulic
system, which comprises a double-oil-pump, an main oil passage, a first valve set, a second valve set, a first cylinder
system, a second cylinder
system, a
control unit and an oil return unit. The first valve set, the
control unit, the oil return unit and the second valve set are connected through the main oil passage sequentially. The
control unit comprises a multi-way
reversing valve, and the oil return unit is communicated with an oil return port of the main oil passage and comprises an internal oil passage. The hydraulic system has a combination state and a linkage state. When in the combination state, hydraulic oil of a first
oil pump flows through the first valve set and the control unit sequentially to enter the inside of the oil return unit through an oil port of the multi-way
reversing valve of the control unit, and then combined with hydraulic oil of a second
oil pump in the second valve set. When in the linkage state, the multi-way
reversing valve of the control unit is located in the middle, the first valve set and the second valve set complete operation respectively. The invention further provides a compression
refuse collector adopting the hydraulic system.