A hammock has a foldable frame. The frame includes two connecting rod assemblies located on lateral sides of the hammock and connected to each other. Each connecting rod assembly comprises first, second, third, fourth, fifth and sixth rods. Tops of the first and second rods are rotatably connected. Bottoms of the third and fourth rods are rotatably connected. The first rod is rotatably connected with the third rod and the second rod is rotatably connected with the fourth rod. A bottom of the first rod is rotatably connected with a bottom of the fifth rod, and a bottom of the second rod is rotatably connected with a bottom of the sixth rod. The fifth and sixth rods each have a positioning groove. Connecting rods rotatably connected to the tops of the third and fourth rods are releasably engageable with the respective positioning groove.