The utility model provides a three-eccentric center butterfly valve with a metal seal. Valve comprising a valve body, an upper valve cover is fixed at the upper end of the valve body; the valve body is internally connected with a main shaft from top to bottom; the main shaft is connected with a valve clack sealed with the valve body; the contact surfaces of the valve body and the valve clack are in conical surface fit; a sealing cavity is formed in the conical surface of the valve clack in an inwards concave mode, a metal O-shaped ring is arranged in the sealing cavity, a sealing ring for pressing the metal O-shaped ring into the sealing cavity is fixed to the outer side face, corresponding to the sealing cavity, of the valve clack, the sealing ring is in conical surface fit with the contact surface of the valve body, and a pressing plate for pressing the sealing ring onto the valve clack is further arranged outside the sealing ring. The three-eccentric center butterfly valve is reasonable in structural design, provides compression amount and deformation amount for sealing of the valve body and the valve clack through conical surface matching and design of the metal O-shaped ring,effectively improves sealing performance, simultaneously is high in sealing surface smoothness due to the fact that the contact surface of the valve body and the valve clack is in conical surface matching, can effectively solve the problem of leakage amount, and prolongs service life of the three-eccentric center butterfly valve.