Well low-speed magnetism floats single branch-cut bridge switch of tiny thread interval, characterized by have a simple turnout of two butt joints, are provided with two simple turnout one sides simultaneously and dodge the roof beam, dodge to be equipped with can be so that dodge the roof beam body follow up mechanism that the roof beam was removed on the roof beam, and it has stiff end buttress roof beam to dodge the roof beam end-to-end connection simultaneously the utility model discloses a space of branch-cut bridge switch has reduced the occupation of land and the degree of difficulty of circuit global design apart from reducing can adapt to the requirement of 4.6m interval circuit to 4.6m from 6.23m, has reduced whole cost