The invention discloses a method and a device for determining a rotation angle of a meter pointer. The method comprises: extracting each edge point in an obtained meter image, determining each straight line formed by the edge points through Hough transformation; determining a straight line with the smallest distance from each reference coordinate point as a target straight line according to at least three preset reference coordinate points; according to slope of a target straight line corresponding to each reference coordinate point and standard slope corresponding to each predetermined reference coordinate point, determining corresponding relationship between the slope of the straight line and the standard slope in the meter image; determining a straight line with the smallest distance from a reference coordinate point of a preset pointer straight line as a target pointer straight line; determining the standard slope of the target pointer straight line according to the slope of the target pointer straight line and the corresponding relationship between the slope of the straight line in the meter image and the standard slope, so as to determine angles of rotation of a pointer. A scheme for accurately determining rotation angles of a meter pointer is provided.