Integrated oven capable of preventing odor tainting

The invention provides an integrated oven capable of preventing odor tainting which has the advantage that a smoke sucking opening is long, and a separate top smoke barrier does not need to be arranged to block smoke. The integrated oven comprises an engine body (1), a bellow (2), a gas collection bin (3) and a stove (4), wherein the stove (4) is arranged on a cooking bench surface (5) of the engine body (1); the gas collection bin (3) is connected with the cooking bench surface (5) to form an L-shaped structure; the upper part of a vertical surface, facing to the stove (4), of the gas collection bin (3) is provided with a rectangular opening (6) which is communicated with a gas collection chamber of the gas collection bin (3); a cover plate (7) which can be opened toward the side of the stove (4) is arranged on the rectangular opening (6); the cover plate (7) is connected with an opening and closing mechanism; the opening and closing mechanism is arranged on the gas collection bin (3); the inner surface of the cover plate (7) clings to the surface of the circumference of the rectangular opening (6) when the cover plate (7) is in a closing state; the gas collection chamber is communicated with the bellow (2); and a check valve which is opened to the side of a smoke flue is arranged at the opening of the bellow (2).