Road deflection testing device

The utility model relates to a road deflection testing device. According to the existing road deflection testing device such as a drop hammer deflectometer, due to structure and function restrictions, the device needs to be adjusted manually and recording needs to be carried out manually during the testing process, thereby increasing the detection time; and a battery block needs to be equipped or the battery of the device needs to be charged for electric energy in the operation process, thereby increasing the use cost for detection. The road deflection testing device comprises a cross beam (2) on which a laser head (1) is arranged; two ends of the cross beam are arranged on two guide rails (5) respectively via a driving wheel (3) and a follower wheel (4); the driving wheel is connected with a stepper motor A (6); a follower wheel is connected with a stepper motor B (7); the stepper motor A and the stepper motor B are connected with a control box (8); the control box is arranged at one end of the cross beam; a