The utility model relates to the technical field of fire hydrant protection box, concretely is a kind of fire hydrant protection box of quick installation, including box and mounting plate, the side of the box is rotatably connected with box door, the side of the box is equipped with connecting port, the back of the box is equipped with mounting device, the mounting device includes connecting plate, the connecting plate is fixedly connected with box, the side of the connecting plate is fixedly connected with two sliding slot, the side of the mounting plate is fixedly connected with two slide rails, the side of two the slide rails away from mounting plate is equipped with several positioning holes, several the positioning holes are evenly distributed on slide rail, the both ends of the slide rail are fixedly connected with connecting piece. The utility model, the fire hydrant protection box of existing use traditional installation method is very time-consuming when installing, and it is not easy to replace and maintain the protection box quickly, so it leads to the installation efficiency of protection box reduces, and the problem of inconvenient replacement and maintenance of protection box.