An embodiment of the invention discloses an image shadow removing method and device which is used for removing shadows in real time, high in speed and high in robustness. The method includes sequentially forming N realtime image areas between the center and the edge of a to-be-processed image by dividing, wherein no overlapped portion exists between each two adjacent realtime image areas, and N is a positive integer larger than or equal to 2; calculating a light intensity average value of all pixel points in each realtime image area, and acquiring a shadow curve ac cording to all light intensity average value, wherein the shadow curve indicates image shadow distribution condition of the to-be-processed image; fitting the shadow curve to acquire a shadow removing function; performing shadow removing on the to-be-processed image according to the shadow removing function.