The invention discloses a pollution-free treatment method of high-salt sludge, and relates to the technical field of the environment. The method includes the first-stage filter pressing step, the stirring and cleaning step, the coagulating and settling step and the oxidizing, filter pressing and washing step. Through the filter pressing, washing, oxidizing and filter pressing process, sludge is free of pollution, pollutants in sludge are effectively removed, especially chloridion and other inorganic components, drug residues and organic pollutants, the sludge is truly free of pollution, the damage to the environment is reduced, no more severe pollution can be caused through the washing method, sewage obtained after washing can be subjected to pollution-free treatment at the same time, recycling can be achieved, the washing effect is not influenced, and residual harmful substances are effectively removed through oxidizing and filter pressing.