The invention discloses a ditch digging machine used for clearing ditches. The ditch digging machine comprises a dragging machine head, an installing frame, a motor installing plate, sliding grooves, clearing frames, digging frames, sliding columns, telescoping plates, connecting plates, fixing frames, universal balls, digging rings, drawing and pulling columns, first rotating columns, second rotating columns and turnover grabbing buckets. The ditch digging machine has the beneficial effects that the ditch digging machine digs the ditches through a plurality of digging frames, people enables the ditch digging machine to dig the ditches with the different depths according to the depth needs of ditch digging, adaptive universality and use variety are ensured, and the high efficiency of ditch digging is ensured. One clearing frame capable of moving up and down is arranged behind each digging frame and can grab, load and turn over fallen soil in the ditches, the universal balls rotate and drive the turnover grabbing buckets to clear the soil and send the soil out, the interior of the ditches after digging is neater and empty, people can manage and use the ditches conveniently later, and convenience of use is ensured. The ditch digging machine is convenient to operate, and all members are connected flexibly.