Led display device and driving method thereof

The invention discloses an LED display device and a driving method thereof. The LED display device comprises pixel units connected with row lines and column lines. The method comprises steps: in each row cycle, gray scale data are displayed in a group-by-group mode; and in multiple continuous groups, reset voltage is adopted to pre-charge parasitic capacitance between the row line and the column line, and thus in-group reset is carried out. The driving method of the invention adopts the in-group reset in the row cycle to lessen interference on display of a low-gray scale image by a high-gray scale image, and thus, the dynamic display quality of the image can be improved.