The invention discloses an array substrate of a fringe-field-switching-type crystal display device. The array substrate comprises a plurality of data lines, a plurality of grid lines, pixel electrodes, first public electrodes and second public electrodes, wherein the grid lines and the data lines are arranged in a crossed mode to define pixel regions, the pixel electrodes are arranged in the pixel regions, the first public electrodes are formed between the data lines and the pixel electrodes, the positions, corresponding to the data lines, of the first public electrodes are hollowed out, the second public electrodes and the pixel electrodes are located on the same layer and the second public electrodes are overlapped with the data lines. According to the array substrate, stray capacitance between the first public electrodes and the data lines is reduced, signal transmission delay is shortened, and power consumption is lowered. Meanwhile, due to the arrangement of the second public electrodes, interference brought to the pixel electrodes by the data lines is shielded, stray capacitance of the pixel electrodes between the adjacent pixel regions is also reduced, interference of the pixel electrodes between the adjacent pixel regions is effectively absorbed, and the quality of displayed frames is improved.