The invention provides an aquatic animal robot backpack, and belongs to the technical field of animal behavior control. The backpack consists of a backpack body, two pairs of backpack straps and two pockets. The backpack body is formed by cutting an elastic fiber material according to the sizes of all parts from the pectoral fin to the anal fins of a carp, and a hole is cut in the middle of the backpack body and used for the pelvic fin to pass through; the two pairs of backpack straps are prepared by two pairs of hook and loop fasteners sewn at the front and rear ends of the backpack body, andthe two pairs of hook and loop fasteners at the two side of a fish body are fitted to the back of the fish body to fix the backpack; the two identical pockets are sewn at the two sides of the backpack body, and waterproof bags containing an electric stimulation device and a power supply are contained in the two pockets respectively. During use, the backpack is worn by the fish, the two waterproofbags containing the electric stimulation device and the power supply are put into the two pockets respectively, and a non-absorbent material is adopted for balancing to keep the fish balanced. By means of the backpack, the electric stimulation device and the power supply can be stably carried on the fish, and the problems are solved that since devices are carried unstably, the devices slide and fall off, and lines are damaged.