The invention discloses a combined type pressure regulating valve which simultaneously has pressure boosting and decreasing functions with longer service life. The invention comprises a valve body, wherein an internally communicated interface, an externally communicated pressure boosting interface and an externally communicated pressure decreasing interface are arranged on the valve body, a pressure regulating bolt is arranged on an upper cover of the valve body, an upper valve plate, an upper corrugated pipe, an upper connecting piece, a pressure regulating spring and an upper pressing block are arranged inside an upper valve cavity, and the internally communicated interface is communicated with the upper valve cavity; a valve seat is fixed in the upper valve cavity, the upper valve cavity and a lower valve cavity are communicated with each other through a valve seat cavity in the valve seat, and the lower valve cavity is communicated with the externally communicated pressure boosting interface; a lower valve plate, a lower corrugated pipe, a reset spring and a lower connecting piece are mainly arranged inside the lower valve cavity, the upper end of a passage in the lower valve plate is in seal contact with the upper valve plate, the lower end of the passage is communicated with the externally communicated pressure decreasing interface, and the lower valve plate can also block off the upper valve cavity and the lower valve cavity. The combined type pressure regulating valve which is widely applicable to the pressure stabilizing system of a low temperature pressure vessel can greatly simplify pipeline structure and improve production efficiency.