The invention relates to a method, device and system for detecting a vehicle through an intelligent lamp post and electronic equipment thereof, and the method comprises the steps: collecting the values of the length, width and height of a truck, and measuring and calculating whether the truck is super-high, super-wide or super-long or not; analyzing the truck nuclear weight, and measuring and calculating whether the truck is overweight or not; calling data of the freight car along the way, analyzing and calculating whether the freight car has weight reduction or not, calculating the total weight borne by the road surface in the road section range according to the set road section, and evaluating the traffic safety. The system can monitor, classify and automatically detect whether the trucks in the coverage area of the intelligent lamp post have overload and overrun conditions or not; an off-site contact measurement technology is realized through the intelligent lamp post control centerto monitor, detect and respond to overrun and overload vehicles; on-site law enforcement of law enforcement officers can be reduced, time-consuming and labor-consuming methods such as manual vehicleblocking and fixed detection point detection are avoided and reduced, road safety, freight transport efficiency and traffic management efficiency are improved, and meanwhile supervision cost and driver consumption are reduced.