Bridge deck drainage device

The utility model discloses a bridge deck drainage device which comprises a water storage tank, a drainage cover is arranged at an opening in the upper end of the water storage tank, and lap joint strips in lap joint with the bottom face of the drainage cover are fixedly connected to the upper portions of the inner walls of the two sides of the long edge of the water storage tank. Bolt connecting pieces used for connecting the drainage cover with the water storage tank are arranged at the two ends of the drainage cover in the length direction of the drainage cover, and a plurality of filter grooves formed in the width direction of the drainage cover are formed in the drainage cover in a penetrating mode. Through mutual cooperation of rollers, transmission belts and a retarding motor, the retarding motor can drive the roller on one side to rotate, meanwhile, under the cooperation of the two rollers, the multiple transmission belts are driven to continuously rotate, and at the moment, shifting rods on the surfa