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This utility model relates to the field of safety protection technology, and provides a fall arrestor self-locking device, including a fall arrestor body, a locking component, and an anti-tipping component. The fall arrestor body has an installation groove and a receiving groove, which are interconnected. The installation groove is adapted to connect with a guide rail, and the groove wall of the receiving groove has a mating part. The locking component includes a pivot, a locking member, and a first elastic member. The pivot passes through the fall arrestor body and is located in the receiving groove. The locking member is located on the pivot and rotates with the pivot. The first elastic member is sleeved on the pivot and connects with the locking member and the fall arrestor body. The anti-tipping component is movably located on the locking member. When the fall arrestor body is in an inverted state, the locking member extends from the receiving groove into the installation groove, and the anti-tipping component extends out of the locking member under the action of gravity, and cooperates with the mating part to limit the connection between the fall arrestor body and the guide rail. This utility model can realize the anti-tipping protection function, avoid the fall arrestor self-locking device from failing due to incorrect installation direction, and improve the safety of the fall arrestor self-locking device.