The invention discloses a new-energy automobile fault diagnosis system based on IOT (Internet of Things) and cloud computing. The new-energy automobile fault diagnosis system is formed by multiple new-energy automobile monitors and a new-energy automobile fault monitoring center, wherein each new-energy automobile monitor comprises a wireless communication module, a microprocessor, a current and voltage sensor, a temperature sensor, a revolution speed sensor, an accelerator pedal sensor, an electric motor monitor, a storage battery monitor, an early warning device and a power supply. The new-energy automobile fault diagnosis system disclosed by the invention has the advantages of simple structure, wide coverage range, comprehensive monitoring, intelligentization, humanization and the like, and convenience can be provided for an after-sales service department of a brand automobile to carry out unified monitoring on the fault information of new-energy automobiles needing to be monitored and protected. When a new-energy automobile of an owner is diagnosed in fault, early warning information can be transmitted to the corresponding owner by the monitoring center, convenience is provided for the owner to pay attention to and treat the fault in time, and the damage and the economic loss to the owner caused by the fault of the automobile can be effectively reduced.