Ultrahigh-pressure hydraulic system

The invention provides an ultrahigh-pressure hydraulic system. The ultrahigh-pressure hydraulic system comprises a reversing valve, a mode switching valve, a one-way valve, a first supercharger, a second supercharger and an oil cylinder, wherein an oil inlet and an oil return port of the reversing valve are connected with a reserved oil source oil inlet and a reserved oil source oil return port of a main engine respectively, a working oil port of the reversing valve is connected with the mode switching valve, a first group of working oil ports of the mode switching valve are connected with the oil cylinder through a one-way valve, and a second group of working oil ports of the mode switching valve are connected with the oil cylinder through the first supercharger and the second supercharger. According to the ultrahigh-pressure hydraulic system, by combining with working conditions of a splitting machine, the ultrahigh-pressure hydraulic system is provided, the working modes can be automatically switched accor