The invention relates to a connection device of a floating wind power station and a water charging pile, and belongs to the technical field of application of a clean energy source. The floating wind power station comprises a floating platform and a wind power generator, wherein a current output from the floating wind power station is input to a full-sealed waterproof junction box which is arranged on a water bottom and is arranged on an underwater support rack through a waterproof cable, two heads of the full-sealed waterproof junction box are sealed by pouring a waterproof sealant, a current output from the full-sealed waterproof junction box passes through the waterproof cable, an input current of a left side of an upper part of the water charging pile passes through a waterproof sealing socket and an electric wire input control circuit, a current output from the control circuit passes through an electric wire, a current output from a right side of the upper part of the water charging pile passes through the waterproof sealing socket, an output current is supplied to a power utilization user through the waterproof cable, and information of a control current of a control circuit is transmitted to an information storage device for storing through an information transmission line. The connection device is beneficial for rapid supplying wind power of the clean energy source to the power utilization user.