The invention provides a whole-vehicle in-loop test bench system of an L3-level automobile driving automobile. The system comprises a chassis dynamometer located at the central position of an annularscreen, wherein a first vehicle is placed on the chassis dynamometer, the first vehicle comprises a first vehicle body and a first vehicle controller, at least one vehicle-mounted camera is installedon the first vehicle body, an image data signal output end of each vehicle-mounted camera is connected with an image data signal input end of the first vehicle controller, and the vehicle-mounted cameras are used for acquiring continuous test scenes displayed on the annular screen. Through the system, changing of the lane line sate in the testing process can be realized; and through real-time synchronous changing of a moving target (e.g., another vehicle, a bicycle and a pedestrian), lane lines and surroundings, whole-vehicle continuous in-loop testing of the L3-level automobile driving automobile is realized.