The invention belongs to the technical field of food processing, and specifically relates to a barbecued pork and a preparation method thereof. The barbecued pork comprises the following raw materials in parts by weight: 80 to 120 parts of lean meat, 2 to 8 parts of liquor, 3 to 10 parts of onion juice cooking wine, 5 to 15 parts of erythritol, 1 to 5 parts of salt, 1 to 5 parts of light soy sauce, 0.5 to 2 parts of pepper powder, 1 to 5 parts of spices, 0.5 to 2 parts of peanut oil, and 1 to 5 parts of raw lemon. The preparation method comprises the following steps: washing lean meats, slicing, adding residual auxiliary materials, rolling the mixture by a rolling machine, after rolling, carrying out static pickling, adding the pickled lean meats into a steamer, steaming the lean meats until the lean meats are cooked, and finally frying the cooked lean meats until the color of the lean meats becomes golden yellow. The preparation method has the advantages that erythritol is taken as the additive directly, the step of sugar decoction is not needed, the step of saccharification coloring is not required for manufacturing barbecued pork, moreover, special spices are added, after a special rolling treatment, the lean meat is better spiced, and the prepared barbecued pork is rich in fragrance, is soft and is suitable for many people.