Lamp tube for promoting photosynthesis of plant growth

The utility model discloses a lamp tube for promoting plant growth photosynthesis, which comprises a lamp tube main body, a voltage stabilizer arranged at one end of the lamp tube main body, an electric wire arranged at one end of the voltage stabilizer, a first bearing arranged on the outer ring surface of one end, far away from the lamp tube main body, of the voltage stabilizer, a second bearing arranged at the other end of the lamp tube main body, and a color changing plate arranged on one side of the second bearing. A first connecting groove is formed in one end of the color changing plate, a second connecting groove is formed in the other end of the color changing plate, and a third bearing is arranged in the first connecting groove. The color changing plate is driven by the motor to rotate, colored light can be adjusted according to different plant varieties or different plant growth stages, accordingly, the plant growth efficiency is improved, and the color changing plate can be prevented from driving