The utility model provides a self-dumping slag transportation trolley, which comprises a rack trolley, a lifting bucket and a pin rod. At least two lifting rings are evenly and fixedly arranged on the upper circumference of the lifting bucket. At least two fixed pin rings are arranged below a trolley support on the longitudinal central axis of the rack trolley. A snap ring is fixedly arranged at the lower circumference of the lifting bucket. A movable pin ring is sheathed with the snap ring. The pin rod is inserted in the fixed pin rings of the rack trolley and the movable pin ring of the lifting bucket and connects the fixed pin rings with the movable pin ring. The self-dumping slag transportation trolley is a simple and feasible self-dumping slag transportation tool used for manual pile and well excavation. Only one worker is required for the entire process of slag lifting, slag transportation and slag dumping and thereby the goals of saving labor and improving work efficiency are realized. Moreover, the utility model has the advantages of simple structure, convenient use, low cost, field manufacturing, simple manufacturing and the like. The self-dumping slag transportation trolley can be widely used for railway construction, road construction, hydropower plant construction, mine construction, municipal construction, civil construction and the like.