The invention relates to a novel circulation experiment water tank. The novel circulation experiment water tank is composed of a U-shaped elbow, wing-shaped flow deflectors, a bolt, a flange, two steel wire nets, a straight tube, a cambered cone-shaped tube, a minor-diameter straight tube, a U-shaped water tank body and a long tapered tube. The whole water tank is made of organic glass, high in transparency and mechanical strength, light in weight and easy to machine. The wing-shaped flow deflectors are small in resistance and good in diversion feature, and the fluid flow speed is effectively controlled. The straight tube and the cambered cone-shaped tube are connected through the bolt and the flange, and can be dismounted conveniently. The steel wire nets are installed in the straight tube section, a water flow vortex flowing from the U-shaped elbow is divided into small vortexes, impact to the water tank is relieved, and the water flow can be inclined to being straight. The long tapered tube effectively prevents an inner bounding layer of the long tapered tube from disengaging. The cambered cone-shaped tube is in a streamline shape and effectively prevents a boundary layer from disengaging, the two ends of the cambered cone-shaped tube are connected through the flange, installation is convenient, and the cambered cone-shaped tube is easy to replace. The novel circulation experiment water tank is good in adjusting performance, stable in operation, convenient to manufacture, even in internal fluid flowing speed and simple in structure, provides great convenience to the actual application, and can be widely applied to indoor hydraulics experiments.