The invention discloses a laser indicating device capable of controlling pattern and size of a projected image. The laser indicating device comprises an enclosure; a man-machine control interface which is arranged on the outside of the enclosure and is used for controlling internal components inside the enclosure from the outside; a frequency/phase control module for controlling a drive energy control module; the drive energy control module for controlling the drive energy of an optical scanning device; a laser beam generation module for emitting a laser beam to the optical scanning device; and the optical scanning device which can use an optical scanning vibration mirror configuration with one or two one-dimensional swing or one two-dimensional swing to cause the laser beam to form a scanning beam in a scanning mode and then projecting the scanning beam outwards to form an image on a projection surface. Therefore, by controlling the man-machine interface, a user can select a projection of a single light spot or a length-controllable straight line, or select a projection of various images such as a size-controllable ellipse, circle or Lissajous pattern and the like so as to enhancethe service efficiency of the laser indicating device.