The invention provides a multifunctional aquarium lamp. The multifunctional aquarium lamp comprises a dovetail groove, a lantern ring, a cleaning brush, a dovetail slide block, a spool, a magnet block, a guide hole, an insert rod and a rubber pressing block, wherein that dovetail groove is formed in the annular side surface of a lamp housing, the lantern ring is arranged on the annular side surface of the lamp housing in a sleeving manner, the cleaning brush is arranged at the lower part of the annular side surface of the lantern ring, the dovetail slide block is fixed in the middle of the annular side surface of the lantern ring, and the dovetail slide block is assembled in the dovetail groove. According to the design, the quick cleaning function of the outer surface of the lamp housing is realized, and the cleaning effect is good. The spool is mounted in the middle in the bracket, the magnet block is mounted in the inner bottom of the guide hole, the guide hole is formed in the frontof the upper surface of the bracket, the insertion rod is fixed on the lower end face of a cover plate, and the rubber pressing block is mounted in the middle of the lower end face of the cover plate. By means of the design, the connection line storage function of the multifunctional aquarium lamp is achieved when the lamp is not used, and the multifunctional aquarium lamp has reasonable structure, good cleaning effect, complete function and high practicability.