A plant-growing lamp capable of effecting a change in local environment includes a container, a lampshade with a fixing space, a lighting unit, a water supply unit, a power supply unit, and a sensor. The container is provided with a receiving space, a water storage space, and a loudspeaker. The lighting unit is provided with a circuit board, which has two sides respectively provided with first and second light-emitting elements and can drive the first and second light-emitting elements to emit light of different colors and of different wavelengths respectively. The water supply unit includes a pipe with a water outlet end facing the receiving space. The power supply unit supplies electricity to the loudspeaker, the lighting unit, the water supply unit, and the sensor. The sensor triggers the loudspeaker, the lighting unit, and the water supply unit to generate a simulated weather condition when sensing an approaching person.