The utility model discloses a float positioner, including setting up at aboveground ground monitoring station, just stretch into on optical fiber cable to the rescue positioning mechanism in the district of permeating water in the pit with optical fiber cable and setting that the ground monitoring station is connected, rescue positioning mechanism includes a plurality of wireless rescue terminals, a plurality of wireless rescue terminals set gradually on optical fiber cable along optical fiber cable length direction, wireless rescue terminal is including the inside storage bottle who is equipped with the nutrient solution, the control module of setting in the storage bottle body and the communication interface of setting on storage bottle, the storage bottle overcoat is equipped with and floats flotation layer, control module includes the treater, power supply, the memory, heart electric sensor, weighing sensor and data transmission unit, the ground monitoring station includes industrial computer and the data transmitting and receiving module who meets with the industrial computer. The utility model discloses utilize the stranded personnel position in floatability storage bottle location, maintain the nutrients of life for stranded personnel take simultaneously, offer help for rescuing stranded personnel.