The invention discloses a height-limiting alarm working ladder, which comprises support columns, beams, a gravity sensor and an alarm apparatus. The height-limiting alarm working ladder is characterized in that the plurality of beams are arranged between the support columns, and are embedded into the support columns; the gravity sensor is arranged above the second beam on the upper sides of the support columns; the alarm apparatus embedded into the support column is arranged above the left of the gravity sensor; rubber convex teeth are arranged on the outer sides of the gravity sensor; and the gravity sensor is connected with the alarm apparatus through a circuit. The height-limiting alarm working ladder has the beneficial effects that through reminding in the three aspects of vision, feeling and hearing, workers are effectively reminded; an unexpected accident due to the fact that the workers exceed the height limit is prevented; and the use safety is relatively good.