The invention discloses an intelligent underwater observation platform, including a sensor, a floating body device, a platform floating ball, a screw propeller and a hoist, wherein the hoist is arranged in the hoist case; the platform floating ball is fixed on the top of the case top plate of the hoist case; a cable on the hoist passes through the case top plate; a middle passage of the platform floating ball is connected with the floating body device, and the screw propeller is installed on the top of the case top plate through a propeller bracket; the sensor comprises a sensor housing and ahydrological detection sensor and a power supply battery arranged inside the sensor housing; the platform floating ball is a shell structure with a channel arranged in the middle and a confined spaceinside; and the shell is provided with a communication module, a control module and an energy module inside the shell. The intelligent underwater observation platform provided by the invention does not need to be anchored on the seabed, and the whole platform can be automatically lifted and lowered in the seawater, and the water body of different depths is automatically detected, and the floatingbody device arranged under the water surface does not affect the navigation channel.