An LED module having a base, a lens assembly, and a light source assembly. The lens assembly has an internal thread and the base has a matching external thread. The lens assembly and base are connected by the threads to faun a closed accommodating space. A sealing ring is disposed at a portion between the thread connection of the base, lens assembly, and accommodating space. The light source assembly is in the accommodating space and at one side of the base. The lens assembly and the base are in threaded connection, providing an increased force bearing surface and even force bearing therebetween, resulting in a secure connection, good leakproofness, and convenient installation and removal. The sealing ring is disposed at the connection of the lens assembly and the base, allowing for an excellent sealing effect between the lens assembly and the base.