A plant lamp includes a radiator member, a power box, and lamp beads. The radiator member includes an upper surface, a lower surface opposite to the lower surface, and side surfaces connected between the upper surface and the lower surface. The power box and the lamp beads are arranged on the upper surface and the lower surface respectively. The power box is electrically connected to the lamp beads. The plant lamp further includes at least one power socket electrically connected to the power box and a wiring module. At least one side surface of the radiator member is provided with a fixing seat, the fixing seat defines a slot capable of engaging with a quick lock. When the two plant lamps are to be assembled, the fixing seats of the two plant lamps close to each other, and the quick lock runs through the slots of the fixing seats of the two plant lamps to lock the two plant lamps together.