The invention belongs to the technical field of separation and purification of chemical substances, and relates to a method for separating and purifying dichloropropane and dichloropropylene by Dorlone, particularly a method for separating and purifying dichloropropane and dichloropropylene from a byproduct Dorlone discharged from a rectification tower in a propylene high-temperature chlorination production process. The method can effectively utilize the Dorlone, and comprises the steps of 1,2-dichloropropane rectification, high-boiling substance separation, 3,3-dichloropropylene separation and 1,3-dichloropropylene separation. By using the method, the recovery rate of the 1,2-dichloropropane is up to more than 80%, the recovery rate of the 1,3-dichloropropylene is up to more than 90%, the two cis-trans-isomers of the 1,3-dichloropropylene can be well separated, the purity of the recovered products 1,2-dichloropropane and 1,3-dichloropropylene is up to more than 99%, and thus, the method has high economic benefit; and the invention has the advantages of simple overall technique, high separation and purification efficiency, good quality and production environment friendliness.