An embodiment of the invention provides a method and a device for determining a high-speed rail user and relates to the field of communication. By the aid of the method and the device, the high-speed rail user can be accurately determined, the service use quality of the high-speed rail user is analyzed through tests, the network test cost is reduced, and the mobile communication network quality is improved. The method comprises steps as follows: S1, whether the updated LAI of user equipment is identical with the LAI in a train location area table or not is judged, wherein the user equipment is an observed user; S2, if the updated LAI of the user equipment is determined to be different from the LAI in the train location area table and the LAI matching number of the user equipment is larger than or equal to a second preset threshold value, the user equipment is determined as the high-speed rail user; S3, if the updated LAI of the user equipment is determined to be identical with the LAI in the train location area table and the time difference is smaller than or equal to a first preset threshold value, the user equipment is determined as a suspected high-speed rail user, one is added to the LAI matching number of the user equipment, and S1-S3 are repeated. The method and the device are used for determining the high-speed rail user.