Overall dimension measuring system of vehicle based on three projection plane theory

The invention discloses an overall dimension measuring system of a vehicle based on a three projection plane theory. The system consists of a body length measuring device, a body width measuring device, a body height measuring device and a measurement and control system, wherein the measurement and control system is arranged in a control room of a detection device; the body length measurement device comprises three body length measurement units which are sequentially arranged in a vehicle forward direction and a length measurement laser range finder fixed on one of the body length measurement units, the three body length measurement units are fixed on a detection device mounting foundation through two support upright posts; the body width measurement device comprises a body width measurement unit which is fixed on the detection device mounting foundation through two support upright posts and is located in front of a tested vehicle; the body height measurement device comprises a body height measurement unit which is fixed on a support upright post of the body width measurement device and is vertical to the body height measurement unit.