The invention relates to the technical field of valves, in particular to a multifunctional valve for petroleum equipment. The structure of a sealing clamping groove is formed in one end of the inner part of a main cavity, the structure of placing a sealing rubber pad in the sealing clamping groove is adopted, and the problem that a valve body leaks is solved due to the action of the sealing rubberpad; and the structures of symmetrically arranging rectangular sliding rails on the two sides of the length direction in the main cavity are adopted, a gate plate is guided through the rectangular sliding rails, so that the problem of incapability of intercepting petroleum due to the fact that the gate plate is easy to rotate is solved.