The invention discloses a method and device for eliminating sum-difference channel phase difference. The method includes obtaining a sum-difference channel coupling angle value; and determining phasecompensation parameters according to the sum-difference channel coupling angle value, and utilizing the phase compensation parameters to correct an orientation error level value and a pitching error level value output by an angle tracking receiver to eliminate the sum-difference channel phase difference. Thus, compared with the prior art in which a user can only add a phase shifter to a certain link on a signal hardware link inside a receiver, additional addition of hardware is not needed, and the sum-difference channel phase difference can be eliminated through processing of digital signals,thereby lowering the hardware complexity of a system and reducing cost; and the calculation complexity is low, the running speed of the system is greatly improved, and the engineering application value is high.