Anti-disassembly closestool water tank cover fixing device

The invention relates to the technical field of closestool box cover fixing, in particular to an anti-disassembly closestool box cover fixing device. Comprising a toilet seat; a box body is arranged on the toilet seat, a drain valve is arranged in the box body, two flushing buttons are arranged at the upper end of the drain valve, a cover plate is arranged on the box body, a fixing ring is arranged on the lower end face of the cover plate along the appearance of the cover plate, and a fixing mechanism used for being fixedly connected with the drain valve is arranged on the cover plate. A reinforcing mechanism fixedly connected with the box body is arranged on the lower end surface of the cover plate; the problems that in the fixing process of an existing closestool water tank cover, a fixing device connected between an existing water tank cover and a water tank is exposed out of the water tank, collision damage is likely to happen, the safety risk is increased, the fixing device is likely to be detached by pe