The invention relates to an improved method of sea cucumber processing technique and a corresponding device thereof. The pre-treating and pre-detecting technique for sea cucumber is to add a pre-detecting process before the washing process of the existing technique and comprises steps of 1) dispersing sea cucumbers; 2) wetting and washing the sea cucumber by spraying with clean water; 3) screening the sea cucumber in terms hole and seam of certain size; and 4) respectively storing qualified sea cucumbers and the selected impurities. The sea cucumber pre-treating device comprises an automatic feeding mechanism (1) and a screening mechanism (2) connected one after another. The automatic feeding mechanism (1) is a structure using a motor (1c) as power to collocate a roller conveyor belt (1a). Structure of the screening mechanism (2) is as follows: a screening slide way is composed of obliquely arranged tubes (2b) of which the inlet is high and the outlet is low; a spraying system is arranged above the screening slide way; and an impurity sink is arranged below the screening slide way. The invention high-efficiently screens dead sea cucumbers and attached impurities through holes and seams without damage so as to provide good condition for the following processes and improve processing quality and product quality of the sea cucumbers.