The utility model provides a lower front portion protective device for a truck. The lower front portion protective device for the truck comprises a hollow protective cross beam. An adjusting support is fixedly connected on the protective cross beam. A fixed installment support is fixedly connected on the adjusting support. Fine adjustment, along the direction of an X axis, of the whole device is achieved through a horizontal adjusting flat hole on the protective cross beam. Movement, along the direction of a Y axis and the direction of a Z axis, of the whole device is achieved through the adjusting support and the fixed installment support. The lower front portion protective device for the truck can be conveniently adjusted according to different types of trucks, is strong in generality, and improves installment flexibility. The lower front portion protective device for the truck is of a split-type structure and simple in structure, can be respectively installed, saves extra input caused by integral hoisting of a small crane, and does not need integrally replacing when being replaced, thereby reducing use cost, and being high in strength, safe and reliable.