The utility model provides a prefabricated cellar and ridge combination, and belongs to the technical field of land consolidation projects. The prefabricated cellar and ridge combination comprises a water cellar and a ridge, wherein the water cellar is arranged on a side of a terraced field; a water cellar body serves as the ridge; the water cellar and the ridge are integrated; the ridge is fixedly arranged above the cellar and ridge combination; the water cellar consists of one or more than one prefabricated boxes which are stacked together; each two adjacent prefabricated boxes are respectively provided with a hollow joint and a water flowing hole which correspond to each other and can be seamlessly connected with each other in a sleeving manner; the boxes are connected with one another through the hollow joints and the water flowing holes and are sealed from the external; the cellar and ridge combination is connected with a grit chamber and an intercepting ditch which are arranged on an upper-stage terraced field by water conduits; the lower portion of the front surface of the cellar and ridge combination is provided with a water taking tube and a dredging opening; a valve is arranged on an opening of the water taking tube; a plug is arranged in the dredging opening; and the bottom of the water cellar penetrates in soil of a lower-stage terraced field. The prefabricated cellar and ridge combination is easy to mount, land is saved, the working period is shortened, the construction field is improved, and the cost is reduced.