The invention discloses a BIM (Building Information Model)-based tower crane collision prevention system which comprises a monitoring terminal arranged at a monitoring command center, and a pluralityof panoramic photographing devices, wherein the multiple panoramic photographing devices interact with the monitoring terminal by information, and each panoramic photographing device is correspondingly mounted on one tower crane near to a target building to carry out panoramic photographing on the target building; a cab of the tower crane is at least provided with the following units: a tower crane communication unit which interacts with the monitoring terminal by information and is used for transmitting moving position information of the tower crane, shot pictures and corresponding identity recognition information to the monitoring terminal, an information identification unit for storing type parameter information of the tower crane, a wireless positioning unit for obtaining position information of a tower tip, a cross beam and a hoisting hook of the tower crane, and a warning indication unit for playing warning indication information received by the tower crane communication unit toa tower crane driver to warn the tower crane driver to take corresponding measures.