Maritime drowning search and rescue method and system based on Beidou positioning technology

The invention provides a maritime water falling search and rescue method and system based on the Beidou positioning technology. The maritime water falling search and rescue method based on the Beidou positioning technology comprises the steps that alarm information of people falling into water and position information of an unmanned search and rescue ship are received; wherein the alarm information is sent by a Beidou positioning module in a drowning alarm device worn by a drowning person through a wireless transmission module; determining a target unmanned search and rescue ship and a target search and rescue route according to the alarm information and the position information; and when the distance between the position of the person falling into water and the initial falling position exceeds a preset value, updating the alarm information and the target search and rescue route. The target unmanned search and rescue ship and the target search and rescue route are selected according to the alarm information o