The invention provides a soil purifying device and method, and relates to the field of soil purifying equipment. The soil purifying device comprises a leaching device, a purifying device and a dryingdevice, wherein the leaching device is used for leaching soil and filtering impurities in the soil, and comprises a leaching tank; a leaching basin is arranged in the leaching tank; a spraying head isarranged above the leaching basin; a vibration motor is arranged in the leaching tank, and is connected with the leaching basin; a filter hole is formed in the bottom surface of the leaching basin; the purifying device is used for purifying heavy metal in the soil, and comprises a purifying tank; isomeric electrodes are arranged on two sides of the purifying tank; molecular films are arranged ontwo side walls of the purifying tank; and the drying device is used for drying the soil. The soil purifying device and method can efficiently purify the soil and remove the heavy metal.