Sliding gable flashing system

The utility model discloses a sliding gable flashing system, which comprises a roof start end gable flashing system, a roof terminal end flashing system and a ridge flexible flashing system. The roof start end gable flashing system and the roof terminal end flashing system comprise gable support angle steel, a gable flashing support, a gable flashing plate and auxiliary gable flashing. The gable flashing plate is fixedly connected to a vertical sewing roof board through fasteners or the auxiliary gable flashing, an tail end of the gable flashing plate is locked with the gable flashing support which is fixedly connected to a wall board through wall fasteners; the ridge flexible flashing system comprises ridge flashing, a gable trim top cover and a ridge flashing end cover. The ridge flashing is fixed on the gable flashing plates which are provided with intervals and arranged at two ends of the ridge through the roof fasteners, and the gable trim top cover is fixed with the gable flashing plate in a sealing mode through seal tape and wall surface fasteners. The sliding gable flashing system reduces effects of temperature internal force and solves the problem that water leakage of metal roof is caused by deformation due to temperature.