The utility model relates to an acquisition device for intersection traffic of a road, in particular to a high-definition vehicle-mounted intersection acquisition instrument. The high-definition vehicle-mounted intersection acquisition instrument comprises a driving device and acquisition instrument bodies, and further comprises a lifting rotating platform which is connected with the driving device. A base is installed on a vehicle roof platform, a cylinder is arranged on the upper portion of the base, a height locating rod is connected to the cylinder side surface, a protruding circular shaft is arranged in the middle of the upper surface of the cylinder, and connected to a circular hole formed in the middle of a rotation driving gear set, and two guide holes are further formed in the base, and matched with a guide column and a ball screw arranged above the base respectively. Lifting and rotating devices are arranged on the acquisition instrument bodies, the traffic of vehicles and pedestrians in any intersection directions can be effectively acquired, and accurate acquired data can be provided before traffic signals are installed. The number of the acquisition instrument bodies is three, the acquisition instrument bodies can be adjusted in all directions, and the traffic of the vehicles on motor vehicle lanes and the traffic of the pedestrians on pavements can be accurately acquired through adjustment each time.