Liquid crystal writing board which can be partially erased and partially erasing method

The invention discloses a liquid crystal writing board which can be partially erased. The partially erasable liquid crystal writing board comprises an upper conductive film, a liquid crystal film anda lower conductive film that are laminated successively and then are attached to a bottom plate. Different conductive areas are separated at the upper conductive film and the lower conductive film; and leading-out electrodes are arranged in the conductive regions and are connected to an erasing module. The erasing module is used for locating the liquid crystal film based on an erasing region determined by the upper conductive film and the lower conductive film and applying voltages to erase the writing in the corresponding area of the liquid crystal film. In addition, a method for partially erasing of a liquid crystal writing board comprises the following steps that: step A1, a gesture mode is preset; step A2, the conductive areas, where the touch gesture is located, of the upper conductive film and the lower cond