The invention relates to a gear type safety hook of a lifeboat. The safety hook is characterized by in that: the safety hook comprises a frame (1), a first transmission mechanism (2), a second transmission mechanism (3), a locking mechanism (4) and a main hook (5); and the first transmission mechanism (2), the second transmission mechanism (3), the locking mechanism (4) and the main hook (5) are disposed on the frame (1). The second transmission mechanism drives the locking mechanism to lock and unlock the main hook. The sustaining force of a control rod of the first transmission mechanism is utilized to maintain the position of the second transmission mechanism. The gear type safety hook has advantages of rapid braking and high safety performance.