The invention discloses a ridging machine for forming a waved ridge, and belongs to the field of agricultural machines. A rack of the ridging machine is provided with a hanging frame and ridgers, wherein the ridgers are installed on the rack through connecting plates and L-shaped angle plates, the connecting plates and the angle plates are connected through different connecting holes in the angleplates, and the ridging depth of the ridgers can be adjusted. The rack is further provided with a roller and an electric control box, the two ends of the roller are connected with electric telescopingcylinders through connecting rods respectively, the electric telescoping cylinders are fixedly installed on the rack, when ridging is conducted, the electric control box controls the electric telescoping cylinders to stretch and retract continuously, the electric telescoping cylinders drive the roller to move up and down, and the ridge is in a waved shape. In the tobacco planting process, tobaccoplants grow at the height of the waved ridge, water drainage is facilitated, and growth of the tobacco plants is facilitated.