The present invention provides a leg length discrepancy corrective sock, which has an elastic strip attached within a sock. A holding space formed between a sock body and a sock sole of the sock and the elastic strip provides for disposing a filler therein, and height of the filler achieves the objective of correcting the difference in length of the lower limbs of the leg length discrepancy sufferer. Hence, equalizing the difference in length of the lower limbs is easily achieved by wearing the leg length discrepancy corrective sock of appropriate thickness.