The invention relates to a preparation method of braised prawns. The preparation method comprises the following steps: (1) taking raw materials; (2) putting prawns into clean water, rinsing, and removing mud; (3) shearing prawn heads from the middle parts thereof; (4) shearing the backs from prawn tails to the prawn heads, so as to facilitate flavor permeating; (5) heating a pot by fire, adding oil, sequentially adding fresh sliced ginger, garlic cloves, dried pepper, Chinese prickly ash, thick broad-bean sauce and white sugar, and frying until the aroma is emitted out; (6) adding the prawns,frying, adding a bouquet garni bag, salt, Baijiu, white vinegar and oyster oil when the color of prawn shells is slightly changed, continuing to fry by large fire, adding beer to submerg the prawns after the color of the prawn shell is changed into bright red color, adding thirteen kinds of spices, and covering with a pot cover; (7) when soup is almost dried, adding aginomoto and chicken essence,continuing to fry, feeding coriander, and taking out of the pot. The preparation method of the braised prawns has the advantages that prawn meat is delicious and mouthful, the loss of nutrients is avoided, nutrition and health are guaranteed, and a face and skin-beautifying function is realized; more importantly, the preparation is simple, and the time is short; the braised prawns are very suitable for people.