Plant growth lamp

The utility model belongs to the technical field of LED lighting, and particularly relates to a plant growth lamp which comprises a lamp shell and an installation base fixedly connected to the top face of the lamp shell, a first movable groove and a second movable groove are formed in the inner wall of the lamp shell, a bottom cover is fixedly connected to the bottom face of the lamp shell, and a light beam adjusting mechanism is arranged on the inner wall of the lamp shell. A dustproof heat dissipation mechanism is fixedly connected to the side face of the lamp shell. The light beam adjusting mechanism comprises an optical lens, a motor, a lead screw, a lamp holder and an auxiliary sliding rod. According to the plant growth lamp, a light source emitted by the lamp can be adjusted according to plant growth requirements through the light beam adjusting mechanism, a motor drives a lead screw to rotate in the light beam adjusting mechanism to control the height of a lamp holder, the distance between the lamp and