The utility model discloses a fish metabolism experiment faece collection device, including receiving the excrement pocket, the open end of receiving the excrement pocket is provided with and is used for the fixed solid fixed ring of excrement pocket open -ended that receives to be provided with and be used for compressing tightly the rubber circle on solid fixed ring, a component open -ended pocket structure with receiving excrement pocket open end, still including the telescopic rod structure who is used for placing and collecting the excrement pocket, telescopic rod structure includes the telescopic link, and the one end of telescopic link is provided with the couple that is used for hooking up solid fixed ring, and the other end of telescopic link is provided with and is used for receiving the excrement pocket was pushed the drain pipe by the wash port rectangular spring. According to the above technical scheme, the beneficial effects of the utility model comprises: , simple structure, reasonable in design can raise the efficiency, again can reduce cost, can also avoid causing the injury to the animal.