A safety gate has a gate body and two first locking units. The gate body has two first connecting elements. The two first locking units are respectively mounted on two opposite sides of a door frame. Each first locking unit has a second connecting element and a blocking element. When the safety gate is closed, each of the first connecting elements is connected with a respective one of the second connecting elements. Each blocking element has a blocking position for blocking a corresponding first connecting element to prevent the corresponding first connecting element from being disengaged from the second connecting element and a pressed position to allow-the corresponding first connecting element to detach from the second connecting element of the first locking unit.