A remediation method for heavy metal contaminated soil through heap construction and cyclic leaching is disclosed. The method includes 1) digging the heavy metal contaminated soil up, crushing and sieving the soil, and constructing a heap; 2) spraying the soil heap with a solution of a leaching agent I to generate transferable heavy metal compounds, depositing the compounds to the bottom of the heap, and collecting a waste leaching solution, with the leaching agent I being a sodium salt of an aminocarboxylic acid type heavy metal organic chelating agent; 3) adding sodium hydroxide or calcium hydroxide into the waste leaching solution, then adding sodium sulfide or sodium bisulfide into the waste leaching solution, and removing formed precipitates; 4) spraying the soil heap with the treatedleaching agent I again; 5) repeating the step 3) and the step 4) until heavy metal contents meet standards; and 6) spraying the soil again by utilizing a desalting agent solution to elute sodium ionsin the soil. The method can effectively improve soil quality of the heavy metal contaminated soil, the leaching agent can be recycled, the cost is low and effects are good.