For the consensus problem of multiple robot fish system, design a multiple robot fish system based on the consensus theory. A multiple robot fish motion model is presented to communication information which based on topology structure. The consensus problem in directed networks of multiple robot fish is analyzed and applied to the formation of leader-follower. With any formation into the local leader-follower mode, the formation and the goal area reaching control is presented based on this model, and put up simulated analysis on underwater Robot fish 2D platform. Finally, simulations are provided to demonstrate the scheme in multiple robot fish system control is efficient.