Protective device for stress corrosion of coal roadway anchor net support

The utility model provides a protection device aiming at stress corrosion of a coal roadway anchor net support. The protection device comprises an anchor rod and an anchor cable which serve as cathode protection objects and are anchored into coal rock. The surface layer of the metal protecting net serving as the net-shaped sacrificial anode is coated with active metal, or the active metal net is clamped between the metal protecting net and the coal rock; the metal protecting net is used for coal roadway anchor net supporting, and when the metal protecting net is used for coal roadway anchor net supporting, the net-shaped sacrificial anode and supported coal rock are kept in close contact while the tensioning effect is provided, the net-shaped sacrificial anode, the anchor rod anchored into the coal rock and the anchor cable form a galvanic couple, and cathode protection is conducted on the anchor rod and the anchor cable. The steel anchor rod and the steel anchor cable anchored into the coal rock are subjecte