When the hoist sets up the overpass roof beam on major trunk roads, often lead to the fact great influence to the traffic of bridge lower part is current, for furthest reduce overhead construction tothe influence of lower part traffic, the utility model provides a folding portal of hoist which comprises girder, landing leg crossbeam, landing leg stand, rotary supporting device and the gyration anchor for can turn around to arbitrary predetermined angle between the girder of hoist and the landing leg crossbeam, reduce to park the occupation of land volume under the state, the minimize is to the current influence of traffic, and utilize anchor positioner to realize the anchor of hoist under different fold condition.