The invention discloses a seafood soup stock. The seafood soup stock comprises the following raw materials: 800-1500 g of sea-tangle, 200-300 g of bonito stick slice, 450-600 g of raw scallion, 80-120 g of raw ginger sheets, 60-140 g of garlic, 1200-2000 g of carrot, 1200-2000 g of white radish, 1200-2000 g of onion, 40-60 g of pepper corn, 45-70 g of dried peeled shrimp, and 80-120 kg of water; and a flavoring comprising 800-1500 g of liquor, 80-100 g of seafood powder, 180-210 g of sugar, and 80-120 g of salt. The method comprises the following steps: 1) immersing sea-tangle for 10 hours, washing the sea-tangle and filtering the sea-tangle, taking the sea-tangle out and putting the sea-tangle; 2) boiling water and adding the sea-tangle for boiling by slow fire, removing the impurity white foams, covering a pot cover for boiling the sea-tangle for 1.5 hours; 3) adding all the raw materials and a flavoring in a pan, boiling the materials for 30 min, taking all the materials out, adding water and stopping until total weight is 100 kg; and 4) boiling the materials for 10 min and filtering the product. The seafood soup stock has high nutritive value and utility value, is suitable for both young and old, and is worth of market popularization.