A method for monitoring an image acquisition device, comprising: determining a stop position of each target vehicle from a first video image acquired by the image acquisition device; determining a marking line comprising a stop line in the first video image according to the stop positions of their respective target vehicles; or determining a marking line comprising a lane line; and determining a deviation amount of the marking line in the first video image from a reference marking line, and determining that the image acquisition device has deviated in a case that the deviation amount reaches a predetermined condition; wherein the target vehicle is determined by: identifying each vehicle existed in each static image of the first video image to obtain a travelling trajectory of each vehicle; determining the vehicle that has experienced stopping during travelling, as a first vehicle, according to the travelling trajectory of each vehicle; and determining the first vehicle without any other vehicle ahead within a predetermined range, as the target vehicle, wherein determining a marking line comprising a lane line_comprises: after the travelling trajectory of each vehicle is obtained, the lane lines are generated according to the traveling trajectory of each vehicle, wherein the lane lines are marked at both sides of a first lane respectively; in the first video image, the first lane is obtained by expanding the traveling trajectory of each vehicle according to a width of the lane measured in a video image sample in advance. determining a stop position of each target vehicle from a first video image acquired by the image acquisition device; determining a marking line comprising a stop line in the first video image according to the stop positions of their respective target vehicles; or determining a marking line comprising a lane line; and determining a deviation amount of the marking line in the first video image from a reference marking line, and determining that the image acquisition device has deviated in a case that the deviation amount reaches a predetermined condition; wherein the target vehicle is determined by: identifying each vehicle existed in each static image of the first video image to obtain a travelling trajectory of each vehicle; determining the vehicle that has experienced stopping during travelling, as a first vehicle, according to the travelling trajectory of each vehicle; and determining the first vehicle without any other vehicle ahead within a predetermined range, as the target vehicle, wherein determining a marking line comprising a lane line_comprises: after the travelling trajectory of each vehicle is obtained, the lane lines are generated according to the traveling trajectory of each vehicle, wherein the lane lines are marked at both sides of a first lane respectively; in the first video image, the first lane is obtained by expanding the traveling trajectory of each vehicle according to a width of the lane measured in a video image sample in advance. identifying each vehicle existed in each static image of the first video image to obtain a travelling trajectory of each vehicle; determining the vehicle that has experienced stopping during travelling, as a first vehicle, according to the travelling trajectory of each vehicle; and determining the first vehicle without any other vehicle ahead within a predetermined range, as the target vehicle, wherein determining a marking line comprising a lane line_comprises: after the travelling trajectory of each vehicle is obtained, the lane lines are generated according to the traveling trajectory of each vehicle, wherein the lane lines are marked at both sides of a first lane respectively; in the first video image, the first lane is obtained by expanding the traveling trajectory of each vehicle according to a width of the lane measured in a video image sample in advance.