The utility model provides an advance timbering advancing jack protector that stretches out and draws back, includes the guard shield of being connected with the side arm base of advance timbering, and the guard shield setting sets up logical groove in the advancing jack top in the middle of the guard shield, sets up the guide block on the jack cylinder, and the guide block is arranged logical inslot in and can be followed logical groove and remove, the guard shield below sets up jack cylinder clamp. The utility model discloses a setting can be along with the guard shield of side arm base removal, and when the advancing jack piston rod promoted the side arm, flexible protector followed the piston rod motion to realized the instant protection to the piston rod, protector's motion direction is accomplished by guide block on the cylinder and guard shield clamp, be somebody's turn to do flexible protector safe and reliable, easy dismounting, can prevent that the piston rod from being injured by a crashing object by coal breakage, the cash that falls, satisfies support normal use.