A safety gate has a main body, a connecting tube, and a first elastic piece. The main body has two first rods and two second rods, and the two second rods are perpendicular to the two first rods. The connecting tube is mounted on the first rods. The first elastic piece has two first functional sides. At least one of the first functional sides is formed on a top surface of the first elastic piece, the two first functional sides abut an inner surface of the end portion, and a first protruding portion is mounted through a connecting hole of the second rod and a joining hole of the connecting tube.