The utility model relates to a drum hoisting machine self -resuming slack rope protection device singly restricts. The unable automatic re -setting of current slack rope protection device. For this reason, the utility model discloses a bear the frame, bear chord position in adapted owner hoisting cable below, it is hung by the spring respectively to bear a both sides, it transversely installs the strip magnet steel respectively to bear a both sides, the both sides position is equipped with respectively about the magnet steel, lower closed type magnetism proximity switch, go up closed type magnetism proximity switch and audible and visual alarm, power series forms warning circuit, therefore, power series forms the main circuit, lower closed type magnetism proximity switch both ends are a parallelly connected bypass hand switch still, perhaps use, down in the replacement of open type magnetism proximity switch, lower closed type magnetism proximity switch, and adjustment main circuit and warning circuit. Originally, can send the slack rope alarm automatically to the main circuit cuts off, and be convenient for fault removed's reset operation, extensively be applicable to the various lists drum hoisting machine of restricting.