The present invention provides a driving behavior detection method and device and belongs to the intelligent transportation field. With the driving behavior detection method and device adopted, the problem that driving behavior abnormalities can be only confirmed through using road mark lines in roads in the prior art can be solved. The method includes the following steps that: the driving direction of a first vehicle, the driving direction of a second vehicle and the reference direction of a road are acquired, wherein the first vehicle and second vehicle both travel on the road; the degrees of a first included angle and the degrees of a second included angle are obtained, wherein the first included angle is an included angle between the driving direction of the first vehicle and the reference direction of the road, and the second included angle is an included angle between the driving direction of the second vehicle and the reference direction of the road; the angle difference of the first included angle and the second included angle is calculated; and when the angle difference of the first included angle and the second included angle is larger or equal to an angle difference threshold value, it is determined that the driving behaviors of the first vehicle and the driving behavior of the second vehicle are abnormal. The driving behavior detection method and device of the present invention are used to detect driving behaviors.