A cradle includes a base, a support, a movable bed compartment, a wire-winding barrel, first and second wire bodies. The compartment is movably connected with the support arranged on the base in a suspended manner. First and second fixed ends are arranged on the bottom face of the compartment in the moving direction of the compartment. The barrel is located between the first and second fixed ends. The barrel is rotationally fixed to the face of the base facing to the compartment. The first and second wire bodies are respectively wound on the barrel, and the winding direction of the first wire body is opposite to that of the second wire body. The free end of the first wire body and the free end of the second wire body are respectively connected with the first fixed end and the second fixed end by means of an elastic member.