The invention discloses a driving fatigue early warning method based on road marking. According to the driving fatigue early warning method based on road marking, a normal distribution method is utilized to conduct area division on a transverse position of a vehicle through a step mode, area data is selected to constitute a Markov prediction model library, and finally driving fatigue early warning is achieved. The driving fatigue early warning method comprises the following steps of S1, choosing a time study object and a data study object; S2, through video analysis for an automobile data recorder, obtaining the distance from a current vehicle to carriageway left side marking, and according to the obtained data, by utilizing characteristics of normal distribution, determining a transverse position distribution range of the vehicle; S3, dividing the transverse distribution area determined in the step S2 through a step mode, which is adopted as a standard for state division, wherein m states are divided in total; meanwhile, the Markov model library is constituted by choosing the data. According to the driving fatigue early warning method based on road marking, a driver can be warned and reminded to improve attention in advance, the property safety of the driver is guaranteed, and the ability for traffic safety monitoring is improved.