The invention discloses a multifunctional driving monitoring early warning system based on a mobile terminal. According to the multifunctional driving monitoring early warning system, data are collected through four wide-angle cameras arranged on a front grating, a left side door mirror, a right side door mirror and a tail door of a vehicle respectively; then, the data are synthesized to form a complete image through the image processing technology; meanwhile, after electronic power-assisted steering data in an ECU of a vehicle and related working condition information of other vehicles are collected through an OBD2 port data collector which is connected to the ECU of the vehicle and comprises a main chip, namely, an eml327 chip, a 2.4 G module and other related circuits, the data are transmitted to a controller through the 2.4 G wireless technology; advancing trajectory prediction of the vehicle is calculated according to other data, including the axle base, the wheel tread and the like, of the vehicle; finally, the image where trajectory prediction is conducted is outputted to the mobile terminal device such as a mobile phone in a wireless mode, and the data are displayed through the mobile terminal device. According to the multifunctional driving monitoring early warning system, real-time image transmission and detection are achieved through a wireless communication method at a low cost.