The invention relates to the technical field of steel casting finish machining devices, in particular to an alloy steel casting car loader which comprises four stand columns, a top beam, a stepping motor and a positioning mechanism. The top beam is fixed to the tops of the four stand columns and fixedly provided with a first transmission shaft and a second transmission shaft, the two ends of the first transmission shaft and the two ends of the second transmission shaft are fixedly provided with first driven chain wheels and second driven chain wheels correspondingly. The stepping motor is fixed to one side of the top beam. The output end of the stepping motor is fixedly provided with a driving chain wheel. A main chain is wound on the driving chain wheel. One end of the main chain is suspended. The other end of the main chain is fixed to a triangular connecting plate. One side of the triangular connecting plate is fixedly provided with a first driven chain and a second driven chain. Compared with the prior art, the alloy steel casting car loader is simple in structure and replaces an overhead crane in the prior art, millions of funding can be saved for enterprises since the overhead crane is omitted, and the alloy steel casting car loader can be manufactured with only 100 thousands RMB or less.