Abstract: A golf putting trainer device for practicing one's putting stroke. The golf putting trainer device includes a mat assembly including an elongate mat having a top surface; and also includes a putter miss-stroke determination assembly including housing members being disposed upon the top surface of the elongate mat, and also including light beam-emitting members being disposed in the housing members, and further including light sensor members being disposed upon the top surface of the elongate mat; and also includes a putter miss-stroke signal assembly including a sound-producing member being disposed in the elongate mat and being connected to the light sensor members and being connected to a power cord for the energizing thereof, and also including a light-emitting member being disposed in the elongate mat and being connected to the light sensor members and to the power cord.