The invention discloses a construction garbage pavement slab reinforced structure for a highway along a river in a mountainous area. The structure comprises a bottom frame, a loading frame, a storageplate and a top frame; two groups of first supporting rods and second supporting rods are vertically welded to the two sides in the bottom frame, and formed through mutual insertion and connection ofmultiple longitudinally arranged connecting rods from top to bottom, side plates are fixedly installed between the connecting rods on the two sides of one end, fixing plates are fixedly installed between the two connecting rods on the two sides of the other end, the loading frame is installed between the two connecting rods on one side, and the storage plate is installed between the two connectingrods on the other side. By means of the reinforced structure, when a subgrade plate is washed by rainwater in use, after water enters waste and gravel in the subgrade plate, the waste and gravel cannot flow, internal sand and stone cannot flow into the river, and a pavement slab can be used safely, cannot collapse, and can be used for a long time on a road in the mountainous area.