The invention provides a low-temperature vacuum heating and stewing method of sea cucumber. The method comprises the following steps of: a first step of preprocessing fresh sea cucumber; a second step of stewing the preprocessed sea cucumber under a low-temperature vacuum condition; a third step of cooling the stewed sea cucumber under a pressure reduction condition; and a fourth step of processing the cooled sea cucumber according to requirements to obtain a sea cucumber processing product. Compared with the existing stewing and processing method of the sea cucumber, the stewing and processing method is adopted, the sea cucumber appropriately tastes in a relatively-low temperature solution cooking environment under a vacuum stewing condition, and the taste keeps the flavor nearly close to that of the fresh sea cucumber, and nutrient components in the body are kept to the maximum extent, such as stichopus japonicas, proteins and vitamins. By using the method, the problem that the sea cucumber cannot be processed to achieve the effect of appropriate taste under a low temperature condition is completely solved by using a physical method, and no food addictives are added during the processing.