According to the present invention, a method for preparing a spicy seafood noodle soup dish including Undaria pinnatifida includes the steps of: preparing Undaria pinnatifida extract water by boiling 3-7 parts by weight of Undaria pinnatifida powder with respect to 100 parts by weight of water for two to four hours; preparing a broth by boiling 20-40 parts by weight of seafood ingredients including squids and crabs with respect to 100 parts by weight of the Undaria pinnatifida extract water for one to two hours; stir-frying a seasoning mixture prepared by mixing vegetables including Undaria pinnatifida, chili pepper oil, liquor, garlic, ginger, salt, pepper, sugar, and chili pepper powder; preparing a broth for the spicy seafood noodle soup dish by adding the seasoning mixture to the broth and boiling the mixture of the seasoning mixture and broth for one to two hours; boiling noodles in the Undaria pinnatifida extract water and washing the noodles in cold water; and adding the noodles to the broth for the spicy seafood noodle soup dish to boil the noodles therein for one to two minutes.COPYRIGHT KIPO 2018본 발명의 미역 짬뽕 제조방법은, 물 100중량부에 대해 미역 분말 3 내지 7중량부를 첨가하여 2 내지 4시간을 끓여서 미역추출수를 제조하는 단계; 상기 미역추출수 100중량부에 대해 오징어, 게를 포함한 해산물 20내지 40중량부를 넣어 1 내지 2시간 끓여 육수를 제조하는 단계; 미역을 포함한 야채, 고추기름, 술, 마늘, 생강, 소금, 후추, 설탕 및 고춧가루를 혼합한 양념혼합물을 볶는 단계; 상기 육수에 상기 양념혼합물을 첨가하여1 내지 2시간 끓여 짬뽕국물을 제조하는 단계; 면을 상기 미역추출수에 삶은 후 찬물로 씻어내는 단계; 상기 짬뽕국물에 면을 첨가하여 1 내지 2분 동안 끓이는 단계;를 포함하여 이루어짐을 특징으로 한다.