The invention discloses a remedying method for removing chrome in contaminated soil of a chromium slag site in situ. The method comprises the following steps of: (1) smashing the air-dried chromium-contaminated soil of the chromium slag site, and sieving the smashed soil; (2) mixing the soil sieved in the step (1) and a citric acid solution to ensure that the moisture content of the soil reaches a set value, carrying out uniform stirring and then carrying out balancing for one day; (3) putting the soil balanced in the step (2) in a soil sample chamber of an electrokinetic remediation device, wherein the two ends of the soil sample chamber of the electrokinetic remediation device are respectively a cathode chamber and an anode chamber; and (4) adding an electrolyte to the cathode chamber and the anode chamber, respectively inserting graphite electrodes in the cathode chamber and the anode chamber, and connecting a power source to ensure that electric currents pass through the soil chamber to carry out electrokinetic remediation, wherein the electrolyte is a KCI solution. For the high-chromium-content alkaline contaminated soil of the chromium slag site, the remedying method is simple in technology, higher in removal efficiency of chrome in comparison with a common electrokinetic remediation method, low in unit energy consumption and lowered in cost, and can effectively reduce the bioavailability of residual chromium in the soil.