The invention provides an on-board monitoring system and vehicles. The on-board monitoring system comprises a first monitoring unit, a processing unit and an information output unit, wherein the first monitoring unit is used for obtaining driving state influence data of a driver in the first vehicle; the processing unit is used for obtaining the driving state influence data from the first monitoring unit, analyzing the driving state influence data and generating corresponding prompt information according to the driving state influence data; and the information output unit is used for obtaining the prompt information from the processing unit and outputting and displaying the prompt information into a visual field range where a driver in the second vehicle can see, and the distance between the first vehicle and the second vehicle is set within a first preset range. According to the on-board monitoring system, the prompt information corresponding to the state of the driver is displayed within the visual field range of the second vehicle through the information output unit so that the purpose of reminding other vehicles located outside the preset range of the first vehicle in real time can be achieved, and the situation that the safety of the other vehicles is threatened is avoided.