The invention provides a novel anti-rear-end collision warning lamp for an automobile. The warning lamp comprises an upper shell, a sealant layer, a solar cell panel, LED lamps, a wire outlet, a cablewire, a storage battery, a connecting wire, a circuit board, sensors, a buzzer, a rear cover, a switch and a sucker, wherein the upper shell is arranged on the upper part of the rear cover through the sealant layer; the solar cell panel is bonded to the middle position of the rear cover; the LED lamps are symmetrically arranged on the two sides of the solar cell panel; the wire outlet is formed in the periphery of the cable wire; the storage battery is arranged in front of the solar cell panel through the connecting wire; the circuit board is arranged on the left side of the storage battery;the sensors are arranged at the two ends in the rear cover; and the buzzer is arranged on the circuit board in a welding mode. According to the novel anti-rear-end collision warning lamp for the automobile, the LED lamps and the sealant layer are arranged, thus, the intelligent degree and the sound warning effect are improved, the use function is further expanded, and the service life is prolonged.