Lens assembly with replaceable lenses

The utility model discloses a lens assembly with a replaceable lens, and aims to solve the technical problem that in the prior art, the lens is usually directly connected to the interior of an assembly shell or is installed through a plurality of bolts, so that the installation and replacement of the lens are very inconvenient. The lens assembly comprises an assembly shell and a lens, the lens is arranged on the inner wall of the assembly shell, a loading and unloading mechanism is arranged between the assembly shell and the lens, and a protection mechanism is arranged at the end of the assembly shell. According to the lens assembly, the fixing bolt can longitudinally move when rotating in the threaded groove, the lens can be taken down when the fixing bolt moves to the outside of the threaded groove, a new lens drives the fixing round hole to be connected to the surface of the positioning column in a sleeving mode, and then the fixing bolt penetrates through the fixing round hole to move to the top of the th