The invention discloses a light rail soil residue vehicle. The light rail soil residue vehicle comprises a residue bucket, an underframe, a walking part and an air braking system, wherein the residue bucket is symmetrical with respect to the center line. Lifting shafts and rotating shafts are positioned at two ends of the residue bucket, the central connection line of the two lifting shafts and the center line of the residue bucket coincide, and the central connection lines of the two rotating shafts are located on the same side of the center line of the residue bucket. The top surface of the underframe is provided with two positioning plates, the positioning plates are provided with U-shaped grooves, the rotating shafts are placed in the U-shaped grooves, and pull type coupling devices are positioned at two ends of the underframe. The walking part comprises two wheel sets, every wheel set comprises an axle, two wheels and an axle box body, and the underframe is supported on the axle box body through an elastic element. The air braking system comprises four braking units, every braking unit comprises a braking cylinder, a connecting rod and a brake shoe, wherein the braking cylinder is fixed on the underframe, one end of the connecting rod is pivoted to the underframe, and the other end of the connecting rod is pivoted to a braking cylinder piston rod. The same underframe, the walking part and the air braking system are used for soil residues of various models, kinds of parts are greatly reduced, and the purchase cost, the logistics cost, the manufacturing cost and the after-sale service cost are greatly reduced.