The invention discloses a conveniently assembled and disassembled energy-saving shower toilet which comprises an external water diversion pipe, a water spraying mechanism and a fixed seat. The fixed seat is fixed onto a toilet cover, the water spraying mechanism is detachably connected onto the fixed seat and fixedly connected with the external water diversion pipe, the water spraying mechanism comprises a fixed head, a main water inlet pipe, a water spraying component, a cold water piston and a cold water nozzle, the cold water piston is provided with a water passing hole, the cold water nozzle is provided with a water outlet hole, the fixed head is detachably connected onto the fixed seat and detachably connected with one end of the main water inlet pipe through a connecting pipe, the other end of the main water inlet pipe is provided with a water spraying nozzle and a cold water outlet, the water spraying component is fixedly connected onto the water spraying nozzle, the cold water nozzle is detachably connected onto the cold water outlet, the cold water nozzle and the cold water outlet enclose a cavity for containing the cold water piston, and one end of the cold water piston extends into the cold water outlet and can do piston movement in the cold water outlet. The water spraying mechanism can be freely disassembled and conveniently used, accumulated water in the pipes can be automatically eliminated, and hot water is conveniently led out of the pipes.