Vehicle-mounted evidence obtaining system and method for urban traffic police

The invention discloses a vehicle-mounted evidence obtaining system and method for urban traffic police, belongs to the field of vehicle-mounted evidence obtaining systems, and aims to solve the problems that a vehicle-mounted evidence obtaining device is inconvenient to mount on the top surface of a police car, the definition of a shot picture is difficult to guarantee, and a supporting part of the evidence obtaining device is easy to damage, the device is integrally displaced, and different parts of the evidence obtaining device are subjected to different degrees of vibration acting force. According to the invention, a foot plate is installed to adapt to the arc-shaped top surface of the police car, information of a violation vehicle is obtained in real time through the top ball machine, the speed measuring radar, the evidence obtaining camera and the high-definition camera, and the violation vehicle is warned through the warning lamp, the illuminating lamp and the warning horn; the connecting spring and th