Large-flow anti-return-overflow floor drain core

The utility model discloses a large-flow anti-return-overflow floor drain core which comprises a main body and a sealing cover, the main body is provided with an up-and-down through port, the lower end face of the main body is provided with a containing concave cavity in an upward concave mode, the sealing cover is embedded in the containing concave cavity, and a gasket is arranged between the sealing cover and the containing concave cavity of the main body in a sealing fit mode. A first hinge seat is arranged on the outer side wall of the lower end of the main body, a first magnetic part is arranged in the first hinge seat, a second hinge seat which extends out of the containing concave cavity and is matched with the first hinge seat is arranged on the outer side wall of the sealing cover in a protruding mode, the second hinge seat is provided with a second magnetic part, and the second hinge seat and the first hinge seat are movably hinged together. Compared with the prior art, when the sealing cover can be