The invention relates to an expanded ammonium nitrate explosive and the technical field of production methods thereof as well as discloses a swill-cooked dirty oil expanded explosive and a production method thereof. The swill-cooked dirty oil expanded explosive comprises the following components of expanded ammonium nitrate, wood powder and swill-cooked dirty oil. The method thereof comprises thefollowing steps of firstly, putting the expanded ammonium nitrate with needed quantity into a mixer and also adding the wood powder with needed quantity into the mixer, wherein the mixing temperatureis 45-60 DEG C, and the mixing time is 5-10m; and secondly, after step one, obtaining the swill-cooked dirty oil expanded explosive by adding the swill-cooked dirty oil with needed quantity into the mixer to be mixed for 10-15m. The invention utilizes the original waste swill-cooked dirty oil, changes the waste into valuable, also protects the environment, greatly lowers the product cost and has remarkable economic benefit.