The invention provides an intelligent sewage treatment device and method. The device comprises a container, as well as a mixing tank, a supermagnetic sewage purification box, a first water tank, an activated carbon filter device, a second water tank, a nano ultrafiltration device, a third water tank, a PAM addition device, a PAC addition device, an ammonia-nitrogen-free drug addition device, an activated carbon cleaning device, a disinfectant addition device, an ultrafiltration cleaning device, a water suction pump, a magnetic seed recovery device, a desliming device and an electric control cabinet which are located in the container. By adopting a supermagnetic separation and purification technology and container installation, the floor area is saved and transportation is convenient; remote maintenance and data monitoring of the intelligent sewage treatment device are achieved through a cloud server; wiring is not needed, a distance limit is avoided, only a mobile phone signal is needed, and a master-slave limit is avoided; data exchange of various modes, such as a one-to-many mode, a many-to-one mode and a many-to-many mode is achieved; and fault maintenance of maintenance personnel can be achieved at any place, and thus the operation cost is reduced.