The invention discloses a feeding, slurry making and grading recovery system for soil washing remediation and belongs to the technical field of soil remediation. The feeding, slurry making and grading recovery system for soil washing remediation comprises a crushing and screening module, a feeding and slurry making module and a washing and particle diameter classifying module in sequence. A crushing and screening device of the crushing and screening module is arranged in a feeding workshop with a tail gas treatment function. The feeding and slurry making module is provided with a rod grinding roller mud dissolving machine internally provided with steel rods. The washing and particle diameter classifying module is provided with a double-layer grading vibrating screen composed of a vibrating motor, a double-layer screen and a high-pressure spraying system. By adopting the feeding, slurry making and grading recovery system for soil washing remediation, the defect that a screen is likely to be blocked due to non-uniform feed particle diameters in the prior art is overcome, and the problems of matching of the washed soil particle diameter and equipment and secondary pollution in the polluted soil pretreatment process are solved.