The utility model relates to a difference high accuracy fairway buoy positioner based on big dipper and GPRS, a serial communication port, including a central processing unit who has at least two sets of communications logic, a central processing unit has two at least communication interface, every communication interface corresponds a set of communication logic, two communication interface are communication interface no. 1 and communication interface no. 2 respectively, communication interface no. 1 links to each other with beidou signal receiving element, communication interface no. 2 and GPRS communication unit, the GPRS communication unit has the network at channel center and difference station to establish wireless data communication via wireless network with the access, a central processing unit still connects the fairway buoy and observes and controls unit and power and auxiliary unit. The utility model discloses the direct mount collects big dipper high accuracy differential positioning and GRPS wireless communication in an organic whole on the buoy.