The invention relates to the field of internet, in particular to a combined internet and handheld AIS (automatic identification system) marine anti-collision method and system; the method comprises: if both a first small ship carrying a first mobile terminal and a second small ship carrying a second mobile terminal are in an area with no internet signal or with instable signal, starting a first AIS communication module built in the first mobile terminal and a second AIS communication module built in the second mobile terminal so that the first AIS communication module acquires first AIS data of the first small ship and broadcasts the first AIS data to a communication range of the first AIS communication module; when the small ships are in the area with zero internet signal or with instable internet signal, starting the first AIS communication module to use very high frequency to communicate second mobile terminals of other small ships in the communication range of the first AIS communication module so that collision of the small ships is prevented.