The invention relates to the field of food processing, in particular to an instant sea cucumber and a processing method thereof. The processing method of the instant sea cucumber includes the steps: adding water into sea grasses, boiling the sea grasses under normal pressure for 0.3-2 hours, filtering the sea grasses after boiling to obtain sea grass filtrate, adding edible sea cucumbers into thesea grass filtrate and cooling the sea grass filtrate until the sea grass filtrate is solidified. The weight ratio of the sea grasses to the water is 1:(30-60). The fishy smell of instant sea cucumbers processed by the method can be obviously reduced and even completely removed, and the instant sea cucumbers have the taste of Q bounce.