The present invention provides a liquid crystal display device (LCD) and display driving method thereof. The LCD includes display panel; scan driver; a plurality of data drivers; first timing controller, for controlling scan driver, receiving and processing first signal, outputting synchronization signal and first driving control signal, the first driving control signal controlling first data driver to drive display of all pixels in a part of pixel rows of n pixel rows; and second timing controller, for receiving synchronization signal and second data signal, processing second data signal, outputting second driving control signal, second driving control signal controlling second data driver to drive display of all pixels in the other part of pixel rows of the n pixel rows. As such, through modifying input and output of two timing controllers, the present invention makes two timing controllers to synchronously support high resolution output of LCD.