Full-section yielding support system and process based on concrete-filled steel tube support

The invention discloses a full-section yielding support system and process based on a concrete-filled steel tube support, the full-section yielding support system sequentially comprises a surrounding rock internal pressure relief space, an anchoring and shotcreting layer, a flexible filling layer, a wall back yielding layer and the concrete-filled steel tube support from surrounding rock to a roadway space, and the surrounding rock internal pressure relief space is a pressure relief space formed by cutting of a hydraulic drill rod and a high-pressure water gun; the interior is flushed by water flow regularly; the anchoring section of the anchoring and shotcreting layer is a conical bag type expanded head; the flexible filling layer is formed by spraying a plastic spraying material; the wall back yielding layer comprises a restrictive yielding layer and an open yielding layer; the restrictive yielding layers are yielding blocks arranged on the two sides of the roadway and concrete layers with the same thicknes