The invention belongs to the technical field of LED illuminators, and particularly relates to a high-power and high-uniformity miniature ultraviolet LED illuminator which comprises a first LED lamp bead, a second LED lamp bead, a third LED lamp bead, a first collimating lens combination, a second collimating lens combination, a third collimating lens combination, a first light combining mirror, asecond light combining mirror, a focusing lens and a square rod. The second collimating lens combination is located on the right side above the first collimating lens combination, the third collimating lens combination is located on the right side of the second collimating lens combination, the first collimating lens combination comprises a first small collimating lens and a first large collimating lens, the first small collimating lens is located on the left side of the first large collimating lens, a first LED lamp bead is installed in the first small collimating lens, the densely-packaged UV-LED array coupling packaging lamp bead has very high energy, it is guaranteed that the light output energy is high, the size is small, and the size of the LED illuminator can be reduced.