The invention belongs to the technical field of display, and particularly relates to an array substrate, a testing method of the array substrate and a display device. The array substrate comprises at least two testing points arranged in a spaced mode, wherein a contact sensor is connected between the two testing points and can generate sensing under the effect of external exciting signals of any one of the two testing points and generate feedback signals on the other testing point so that whether a probe makes effective contact with the testing point or not can be judged according to the feedback signals of the other testing point. By means of the array substrate and the corresponding testing method thereof, it can be effectively avoided that in the testing process, a probe for signal inputting is disengaged or omitted, and device false detection is caused; probe disengagement or omission is conveniently and accurately recognized.