The invention discloses a latch hook of a sliding door and window. A groove opening of a spring mounting groove (1) is connected with a connector of a lock rod (2) and an unlocking finger handle (5). The connector of the lock rod (2) and the unlocking finger handle (5) is connected with the lock rod (2) at the groove opening of the spring mounting groove (1), and the lower end of the lock rod (2) is connected with the unlocking finger handle (5). The left end of the lock rod (2) is connected with a bent hook (4). Due to the fact that the included angle between the lock rod (2) and the unlocking finger handle (5) is an acute angle, the colliding connection of the bent hook (4) and a hook can be facilitated, and meanwhile convenience is provided for disconnecting the bent hook (4) and the hook through the unlocking finger handle (5). Due to the fact that the latch hook is mainly made from an aluminum alloy profile, the latch hook can be industrially produced on a large scale, and cost is only more than 0.1 yuan and can be basically ignored. Therefore, the latch hook has the beneficial effects of being simple and practical in structure, low in manufacturing cost and convenient to use.