The invention provides a drunk driving monitoring method and device. The method comprises the following steps of collecting running data of a vehicle from a CAN bus of a running vehicle; comparing the running data with preset drunk driving data; if continuous preset times of running data all satisfy the preset drunk driving data, judging that a driver is in a drunk driving state; and when judging that the driver is in the drunk driving state, prompting the driver. The invention does not need to self-mount relevant sensors for detecting drunk driving and also does not need to remodel the vehicle. According to the invention, the working situation of the driver is indirectly judged through collecting the running data from the CAN bus of the running vehicle, performing algorithm processing on the running data and analyzing the running working situation of the current vehicle. When drunk driving exists, visual and acoustic alarms are sent in time so that the driver can found the alarming in time and stop the vehicle to take a rest; therefore, the running safety of the vehicle is enhanced.