The invention belongs to the field of water conservancy facilities, and particularly relates to an automatic intercepting device of water way floating objects. The automatic intercepting device can automatically run through currents. The automatic intercepting device comprises a garbage collecting tank, a garbage intercepting and collecting device, a bubbling device and a power device. The garbagecollecting tank floats on the water surface. The garbage intercepting and collecting device comprises a rear roller, a middle roller, a front roller, a longitudinal net and a transverse net. The longitudinal net is tensioned through a triangle composed of the rear roller, the middle roller and the front roller, and the transverse net is tensioned through the middle roller and the front roller. The bubbling device is arranged in water and located in front of and below an intercepting net. The power device is used for supplying power to the garbage intercepting and collecting device and the bubbling device.