With the continuous development of building technology, prefabricated buildings are becoming more and more popular. Precast sentry box is one of them, which is widely used in various industries and places as a safe, environmentally friendly and convenient facility. Next, this paper will explain in detail its uses and advantages. Precast sentry boxes are widely used in various public facilities, communities and some industrial places, such as factories, shopping malls, parking lots and so on. In these places, prefabricated sentry boxes mainly play a variety of functions such as safety, management and fire fighting.For example, the prefabricated sentry box can be used as a guard room to assist security guards and related staff in patrolling and monitoring safety to ensure the safety of the place; It can also be used as a duty room to manage some public facilities, such as parks, squares and communities. ; In addition, the prefabricated sentry box can also be used as a fire room, equipped with corresponding fire-fighting equipment and safety facilities to ensure the fire safety of the place. Compared with traditional buildings, prefabricated sentry boxes have many advantages.