The invention belongs to the field of application of hydraulic systems, particularly relates to a high-and-low pressure regulating valve bank and aims to solve the problems that a conventional hydraulic system is large in working pressure impact, poor in stability and high in production cost. The high-and-low pressure regulating valve bank is characterized by mainly comprising a main high-pressure oil circuit, a low-pressure circuit and an unloading circuit, wherein the main high-pressure oil circuit is communicated with the low-pressure circuit; the low-pressure circuit is communicated with the unloading circuit; and the main high-pressure oil circuit is communicated with the unloading circuit. By use of the characteristics and the functions of common hydraulic components and parts, convenient and stable high-and-low pressure switching and unloading of the system pressure are realized. According to the flow and pressure specification ranges and the using functions of the hydraulic system, the required components and parts can be conveniently selected and bought, pressure switching and unloading of the hydraulic system can be realized without complicated operation, impact caused by instantaneous pressure changes is reduced, and normal operation of the hydraulic system is protected.