The invention relates to an
underwater imaging device for annular
laser lighting, comprising an optical window, an shell, a lighting optical device, a receiving and detecting device and an electronic control module, wherein the light optical device composed of a
laser, a
beam expander, a front lens, a rear lens and an all-trans lens is arranged in the shell; and the receiving and detecting device is composed of a
zoom lens and a camera. The imaging device is characterized by comprising an annular all-trans lens and a beam-transforming device, wherein the annular all-trans lens is arranged in front of the
zoom lens, is coaxial with the
zoom lens and the camera, and is placed at an angle of 45 degrees; and the beam-transforming device is arranged between the
beam expander and the front lens and causes
Gaussian beam sent by the
laser to be transformed into annular beams. The imaging device of the invention has high
imaging quality, can acquire clearer images under the condition of being far away from turbid body of water, is a novel
underwater imaging device for
underwater detecting operation, and plays an importation role in ocean detection in our country.