Water purifying device and operation method of water purifying device

The invention belongs to the field of water purifiers, and in particular relates to a water purifying device and an operation method of the water purifying device. The water purifying device comprisesone or more semipermeable membrane element raw material supply pipelines 2, a semipermeable membrane element 1, a water yielding supply pipeline 4 and a strong water supply pipeline 3. The water purifying device also comprises a pressure and/or flow control system. The pressure and/or flow of the pipeline can be controlled according to the water demand of a water demanding port, so that the energy consumption is lowered to a great extent, and meanwhile, the membrane is cleaned according to the polluting degree of the membrane, and pollution of the semipermeable membrane is inhibited, so thatthe water purifying device operates stably while ensure a high recovery rate, the service life of the membrane is not lowered, and the water quality safety of membrane produced water is ensured. 本发明属于净水机领域，包括个或多个半透膜元件原水供给管路2、半