The invention discloses a caution light device for a numerical control machine, which is convenient for installation and maintenance. The caution light device comprises a base, wherein a fulcrum bar is connected to the base, a support is fixedly connected to the upper end of the fulcrum bar, a cable penetrates into the fulcrum bar, the lower end of the cable penetrates out of the middle of the base, a connecting bar is fixedly arranged on the support, a bottom layer circuit board is fixedly arranged on the connecting bar, a bayonet socket is electrically connected to the upper surface of the bottom layer circuit board and is electrically connected with the cable, a buzzer circuit board is electrically connected to the lower surface of the bottom layer circuit board, a buzzer is electrically connected to the buzzer circuit board; and a caution light monomer is arranged on the connecting bar in a penetrating manner and comprises a light shade, a reflector is arranged in the light shade,the connecting bar penetrates through the middle of the reflector, an upper layer circuit board is fixedly connected to the upper end of the reflector, a socket is electrically connected to the uppersurface of the upper layer circuit board, a lower layer circuit board is electrically connected to the lower end of the reflector, the lower layer circuit board is electrically connected with the upper layer circuit board through a lead, and the lower layer circuit board and the upper layer circuit board are fixedly arranged in the light shade.