The invention discloses a garbage-compression-box power unit comprising an oil tank, an oil pump, a push-plate oil cylinder and a tipper-hopper oil cylinder. The oil tank is connected with the oil pump, the output end of the oil pump is divided into two ways, one way is connected with the push-plate oil cylinder through a two-position-four-way reversing valve and a two-position-four-way guide valve, and the other way is connected with the tipper-hopper oil cylinder through a three-position-four-way valve. According to the garbage-compression-box power unit, the integrated degree and the automation degree are obviously improved, high pressure, high speed, high power, high efficiency, low noise, low energy consumption and long life of the garbage-compression-box power unit are achieved, alarm can be conducted in a binful state, and the position is reported.