The utility model discloses a portable collapsible rail relates to construction protection articles for use technical field. Portable collapsible rail, it is including side fence connecting piece and the side fence more than three groups, the side fence includes two spinal branch poles and angle locking mechanism, and two spinal branch poles middle part is articulated, and angle locking mechanism includes the fitting pin and sets up the locking dish and locking hole on two spinal branch poles with one side fence respectively, be provided with the locating hole on the locking dish, the position in locking hole is corresponding with the position of locating hole, the side fence encloses circlewise through two liang of connections of side fence connecting piece, side fence connecting piece includes two articulated branch connectors. Merge the two spinal branch poles on each side fence, what the rail was whole natural contracts portable to central authorities, open into certain angle, the whole outside extension of rail with the two spinal branch poles on each side fence, the quantity that reduces the side fence is increased through side fence connecting piece, portable collapsible rail's area can be adjusted at will. It is fixed that locking mechanism can realize that portable collapsible rail stabilizes for a long time.