The invention discloses underwater radiation-resistant laser measuring equipment. The underwater radiation-resistant laser measuring equipment comprises two sealed tanks, and radiation-resistant shielding layers arranged inside the two sealed tanks, as well as a laser emitting assembly and a laser receiving assembly which are arranged inside the two sealed tanks respectively, wherein an opening is formed in one side of each of the two sealed tanks; radiation-resistant glass plates are connected to the openings of the two sealed tanks; both the laser emitting assembly and the laser receiving assembly comprise reflecting mirrors; the laser emitting assembly further comprises lasers, laser emitting lenses and two-sided mirrors; the same mirror surfaces of the two-sided mirrors face the mirror surfaces of the reflecting mirrors in the laser emitting assembly and the lasers at the same time; the mirror surfaces of the reflecting mirrors in the laser emitting assembly face the mirror surfaces of the two-sided mirrors and the laser emitting lenses at the same time; the laser receiving assembly further comprises photoelectric converters and laser receiving lenses; the mirror surfaces of the reflecting mirrors in the laser receiving assembly face the photoelectric converters and the laser receiving lenses at the same time. The underwater radiation-resistant laser measuring equipment can improve the measuring accuracy during diameter and clearance measurement of fuel rods, and can provide a guarantee for safe operation of a reactor.