The invention provides a lock protection device for a cable distribution box and relates to a safety protection device for locks. A recessed box plate (1) is arranged in the middle of a box door (10) and movably connected to the middle of a double-wing rotating shaft (3), intra-door double wings of the double-wing rotating shaft are connected with one end of an upper lock rod (2) and one end of a lower lock rod (5), an opening/closing plate (6) is hinged to the extra-door face of the double-wing rotating shaft through a shaft (4), and a buckling hole in the opening/closing plate is matched with a lock catch (7) on the lower portion of the recessed box plate. A flat plate on the upper portion of lock protection angle iron (8) is connected to the upper portion of the buckling hole in the opening/closing plate. The buckling hole is shielded by a vertical plate of the lock protection angle iron in a spaced manner, and a hanging lock (9) is hung to the lock catch. According to the lock protection device for the cable distribution box, the lock protection angle iron is additionally arranged on the buckling hole in the opening/closing plate, so that a jaw of a pressure clamp cannot be close to the hanging lock, and the situation that electric equipment in the cable distribution box is stolen is prevented effectively.