The invention relates to a rigid catenary system automatic disconnection-reset device. The device comprises a slide type bus bar connector, a middle section movable bus bar and a hinge type bus bar connector, wherein the slide type bus bar connector and the hinge type bus bar connector are respectively fixed to bus bar fixing ends on two sides of the opening and closing trajectory of a flood gateor a partition gate, and one end of the middle movable bus bar is fixed with the hinge type bus bar connector through a hinge. The movable bus bar can rotate along the hinge through the hinge type connector to change the connected state of the bus bar. The slide type connector is mounted on another fixed bus bar and comprises a fixed mounting seat and a slider, and a groove matched with the section of the bus bar is arranged inside the slider.