The invention discloses an intelligent anti-theft system and an intelligent anti-theft method for an automobile based on Internet of things. The system comprises a system module, a microwave sensor, a GSM processing module, a WEB module, a buzzer, a GPS processing module and a camera module; the microwave sensor, the GSM processing module, the WEB module, the buzzer, the GPS processing module and the camera module are connected to the system module. The system performs recognition, monitoring, positioning and tracking through a network, and sends out an alarm sound signal to more effectively prevent theft, and can continuously receive signals of a GPS satellite. Provided vehicle motion state data include operating speed, operating direction, time information and height information; in a GSM network coverage range, a vehicle-mounted monitoring terminal can exchange data with a monitoring center and a mobile phone of a user; if the anti-theft system detects accidents, the system automatically starts a camera function to take a picture; after the user sets the anti-theft function, once abnormality is detected, the system can send out an alarm sound.