The invention provides a marine floating algae tracking and monitoring buoy, and relates to the technical field of marine equipment. According to the marine floating algae tracking and monitoring buoy, a sensing instrument is arranged on a buoy body and comprises the buoy body, a supporting frame, a reverse pushing sleeve, a piston, a first reverse pushing rod, a second reverse pushing rod, a water wheel, a floating body, a transmission rod and the like. The buoy body is connected with a reverse pushing sleeve on the supporting frame through a reverse pushing rod and a piston, a water wheel is arranged in the reverse pushing sleeve, a water wheel rotating shaft is connected with a floating body through a transmission rod, and a power generation cabin and a battery cabin are arranged in the floating body. According to the marine floating algae tracking and monitoring buoy, when the buoy swings by a large margin due to large stormy waves on the sea surface, the piston moves along the reverse pushing sleeve, seawater enters or is sprayed out of the reverse pushing sleeve, and the seawater generates counter-acting force opposite to the toppling direction on the buoy through the piston and the reverse pushing rod so as to buffer toppling of the buoy; when seawater flows in the reverse thrust sleeve, the seawater pushes the water wheel to rotate and further drives the generator to generate electricity, and electric energy is stored in the battery pack to be supplied to a sensing instrument and the like for use.