Endoscopic deep hole inner surface multiplication imaging device

The invention belongs to the technical field of geometric quantity precision measurement based on machine vision, and provides an endoscopic deep hole inner surface multiplication imaging device. The endoscopic deep hole inner surface multiplication imaging device comprises an imaging device shell, a coaxial circular structure light incident lens group, a measurement area triangular imaging lens group, a parallel light emergent lens group, an optical magnifying lens group, an annular laser and an industrial camera. By designing an optimal light path, arranging an internal lens group and constructing an endoscopic multiplication imaging device, high-precision imaging is carried out while micro features in a deep hole are amplified and multiplied, so that the problem that the appearance of the inner surface of the deep hole is difficult to obtain is solved; moreover, the device has the advantages of high-resolution imaging, convenience in observation of the morphology in the hole, portability, easiness in disas