The invention discloses a water purification device for intelligent closestool washing. The device comprises a master control central shaft, two water-channel switch rotors, a purification bottle, a sterilization optical rod and a main body, wherein the master control central shaft, the water-channel switch rotors and the purification bottle are mounted on the main body; the master control centralshaft is in driving connection with the water-channel switch rotors; the master control central shaft is fixedly connected with the purification bottle; the purification bottle comprises a sterilization optical rod mounting groove; the sterilization optical rod is mounted on the purification bottle through the mounting groove. According to the water purification device for intelligent closestoolwashing disclosed by the invention, an innovative mechanical structure is adopted, the device is simple in structure and small in size, can be quickly assembled, disassembled and maintained, and meanwhile has the functions of sterilization and filtration of a water body.