The invention provides a pressure relief controlling regulating valve with pressure capable of being visible. The pressure relief controlling regulating valve comprises an upper valve body and a lower valve body, wherein the upper valve body and the lower valve body are fixedly connected; an isolation plate is arranged in the middle of lower valve body; a portion, connected with a left connecting opening and a right connecting opening, of a cavity is divided into two independent cavities by the isolation plate; the position, below an upper connecting opening of the lower valve body, of the isolation plate is of a horizontal structure; a water flowing hole facing the upper connecting opening directly is arranged on the horizontal position of the isolation plate; an outer pressure valve element capable of sliding up and down is installed inside an installing hole of the upper valve body; an inner regulating valve element is installed in the middle of the outer pressure valve element in a sliding and sealing mode; the water flowing hole is a cylindrical hole; the lower portion of the inner regulating valve element and the water flowing hole are assembled in a sliding and sealing mode; and the inner regulating valve element is connected with a pipe thread in a threaded mode. When the valve is in use, the water pressure inside the lower valve body can be convenient to observe for people through a lower scale of the outer pressure valve element. The quantity of pressure relief can be adjusted by adjusting the height of the inner regulating valve element.