The invention relates to a multi-sensor fused comprehensive car alarm system which comprises a multi-sensor fusion module, a central processing module, a wireless communication module, a GPS (global position system) positioning module and an alarm device, wherein the multi-sensor fusion module is connected with the central processing module; the central processing module is connected with the alarm device and the GPS positioning module, and carries out interaction with a mobile phone of a car owner by the wireless communication module; the multi-sensor fusion module adopted by the invention comprises a microwave Doppler sensor, an acceleration sensor, a pyroelectric infrared sensors and a Hall switch element, so that the multi-sensor fusion module can carry out all-round monitoring on carinformation and cope with various theft means, thereby improving the security and reliability of the system, and reducing the rate of error alarming; the alarm device comprises an antiriot spray device, so that the car owner can remotely control a thief and subdue a thief on site; the wireless communication module supports video transmission, picture transfer and short message supervisioning; andmeanwhile, the car alarm system also has the GPS positioning module, thereby facilitating the position search of a car.