Built-in multi-stage telescopic tray for shelter of unmanned aerial vehicle and telescopic method of tray

The invention discloses a shelter built-in multi-stage telescopic tray for an unmanned aerial vehicle and a telescopic method of the shelter built-in multi-stage telescopic tray for the unmanned aerial vehicle. The shelter built-in multi-stage telescopic tray comprises a fixed frame, a multi-stage bearing sliding rail, a telescopic tray body, a plurality of limiting locking mechanisms and a bearing bracket; the multi-stage bearing sliding rail comprises a base body used for being connected with the fixed frame and a multi-stage telescopic sliding rail installed on the base body in a telescopic mode, the telescopic tray is connected with the multi-stage telescopic sliding rail, the limiting locking mechanism is arranged on the multi-stage telescopic sliding rail, and the bearing bracket is installed on the telescopic tray. By the adoption of the multi-stage telescopic guide rails, multi-stage stretching and retracting of the tray in the stretching direction can be achieved, stable limiting is achieved during d