The invention provides a data display method and device. The method comprises the steps that a display instruction is monitored, and when the display instruction is monitored, data to be displayed are obtained, wherein the data to be displayed comprise a plurality of pixel points, and each pixel point is provided with first coordinates; a preset inversion rule is utilized for inverting the first coordinates of each pixel point so that second coordinates of each pixel point can be obtained, then the inverted data to be displayed are displayed on a screen of a terminal device according to the second coordinates of each pixel point, in this way, a user can fix the terminal device to a preset position so that the terminal device and display media like a vehicle windscreen pasted with a non-transparent film can be located at opposite positions, the display media can display the data to be displayed in the forward direction, and then the user can watch content on the terminal screen normally through the display media.