The sliding hangar door adopts a lower load-bearing and upper guiding form. The operation mode is flexible and diverse, and can be operated on one or both sides, or as a door library for each other. It can adopt independent operation of each door or linkage operation of multiple doors. The track can adopt various forms such as single track, double track, or multi track, and the door leaf can be divided into multiple combinations such as double leaf and multi leaf. The gate is equipped with limit and protection devices, as well as safety protection devices, to prevent mutual collision between door leaves.