The invention provides a liquid crystal display device with a built-in touch device. The liquid crystal display device comprises a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate is provided with a scanning line, a data line and a plurality of pixel units; each pixel unit comprises three pixel subunits; each pixel subunit is provided with a film crystal switch and a pixel electrode; the second substrate is provided with a conductive PS; one pixel subunit is internally provided with a microswitch, a Y-sensor line which is parallel to the data line and is positioned in the same layer together with the data line, and a conductive PAD; the microswitch comprises a grid electrode connected with the scanning line, a source electrode connected with the Y-sensor line and a drain electrode connected with the conductive PAD; and the conductive PAD is opposite to the conductive PS. According to the liquid crystal display device provided by the invention, an existing press resistance-type built-in touch device is improved, defects of such devices at present are overcome, the aperture opening ratio of pixels is improved, a press resistance-type built-in touch technology can be applied to large-size panels, and the driving circuit of the touch device is simplified.