The triangle lock is designed in strict compliance with industry safety standards and is made of high-strength materials to ensure that it can unlock the elevator door stably and reliably in an emergency while avoiding secondary damage to the elevator system. When an elevator malfunction or a power outage causes passengers to be trapped, the elevator triangle lock can be quickly inserted into the elevator door lock system to achieve quick unlocking; the triangle lock is easy to operate, easy to carry, highly durable, and simple to maintain.