The invention relates to testing equipment for a road surface and discloses a testing device for the structure wave spectrum of the road surface. The testing device comprises two inverted-T-shaped brackets, wherein a round disc is arranged between vertical rods of the two inverted-T-shaped brackets; a plurality of dovetail-shaped radial tracks are arranged at the lower bottom surface of the round disc and are respectively and correspondingly provided with a plurality of sliding blocks; the plurality of sliding blocks are correspondingly provided with a plurality of laser ranging sensors; a motor is arranged at the central position of the lower bottom surface of the round disc; an output shaft of the motor is provided with a winding disc which is fixedly connected with one end of each steel wire rope; the other ends of the plurality of steel wire ropes are respectively and correspondingly connected with the plurality of laser ranging sensors which are respectively and correspondingly connected with one end of each spiral spring; the other ends of the plurality of spiral springs are correspondingly fixed at a plurality of circumferential equally-divided points of the round disc; linear speed sensors are fixedly arranged at the side directions of the laser ranging sensors. The testing device disclosed by the invention has the advantage that the structure wave spectrum of the road surface can be fast and accurately tested.