The invention belongs to the technical field of aquatic product processing, and particularly relates to a barbecue dried salted Spanish mackerel and a preparation method thereof. A frozen Spanish mackerel serves as a raw material and is sequentially subjected to operations of pretreatment, pickling, seasoning, dry-curing, coating, vacuum packaging and the like to obtain the barbecue dried salted Spanish mackerel. According to the method, a preparation technology is simple, the barbecue fragrance of the dried salted Spanish mackerel is added by seasonings such as passion fruit juice, cumin powder and garlic powder in seasoning liquid, the preservation performance of the dried salted Spanish mackerel is improved by coating liquid such as sodium alga acid and high fructose corn syrup, a quality guarantee period is prolonged, and the high fructose corn syrup is heated and decomposed and can supply attractive burnt sugar color for the dried salted Spanish mackerel. The barbecue dried saltedSpanish mackerel can be directly used for barbecuing after a packaging bag of the dried salted Spanish mackerel is opened, and cleaning of the dried salted Spanish mackerel is omitted. When dried salted Spanish mackerel is barbecued, a small number of seasonings can be added or any other seasonings are omitted, and the dried salted Spanish mackerel with rich flavors and attractive colors can be barbecued.