The invention discloses a valve of an eccentric circle opening combined valve core. A valve rod which is controlled, a rotating disc (2), a rotating pin (3), a combined valve core (6), a core positioning seat (7), a hinge branch pin (8) and an oval hole plus round hole (9) are clockwise rotated for 90 degrees in parallel along a 90-degree circular arc track on a fixing disc (4); the sealing surface on the combined valve core (6) is opposite to the sealing surface of the a valve seat (5); the valve rod (1) and the rotating disc (2) are continuously and clockwise rotated in parallel; an eccentric double-ring concave circular groove (2a) on the rotating disc (2) drives the rotation angles of the rotating pin (3) and an convex button (3a) of which the upper end is in arc shape to keep the match of large arc-shaped surfaces, and forcblyforcibly drives the rotating pin (3), the combined valve core (6) and the sealing surfaces to tightly press in rolling towards the sealing surface of the valve seat (5) along a straight track connected with the 90-degree circular arc track on the fixing disc (4) and meanwhile along a rolling track consisting of the oval hole plus round hole (9) at the lower end of the combined valve core (6), the core positioning seat (7) and the hinge branch pin (8), to form a forced sealing force.