The utility model discloses a from anchor device for stock, include from anchor piece and spring, anchor rod body is close to the setting of drill bit one end can follow its gliding connecting seat ofgoing up, go up on the connecting seat articulated have at least two from the anchor piece, the spring housing is established on anchor rod body, the spring is close to to be provided with from anchor piece one end can follow anchor rod body connecting seat under gliding, every is kept away from from the anchor piece and all articulates the one end that has a connecting rod, the other end and thelower connecting seat hinge of connecting rod with last connecting seat end, the spring is kept away from and is provided with positioning cap from anchor piece one end, the last Z shape trigger thatis used for fixed spring that is provided with of anchor rod body, Z shape trigger is connected and is used for triggering the steel wire that triggers that it opened, the utility model discloses overall stability before the reinforcing stock is personally experienced sth. Part of the body with silt thick liquid and soil (rock) improves stock anchoring effect.