The invention discloses an LED plant modulator tube with a four-sided light-emitting function. The LED plant modulator tube comprises a four-sided heat-dissipating aluminum profile; lamp panel groovesare formed in the four sides of the four-sided heat-dissipating aluminum profile, and positioning grooves are formed in the two sides of each lamp panel groove; hexagonal cylindrical plugs are arranged at the two ends of a cylinder-shaped lampshade, and the hexagonal cylindrical plugs and the cylinder-shaped lampshade are fixed in a sleeved-connection mode; and modulator tube joints are arrangedat the two side ends of a waterproof joint and fixedly connected with the waterproof joint. When the LED plant modulator tube with the four-sided light-emitting function is used, the hexagonal cylindrical plugs are connected in series through the modulator tube joints, the problem of electrical line connection of the lamp is effectively solved, and a large amount of input cost and transformation cost are saved; a matching rope and a fixing piece are mounted into a required combination, and thus the operation problems that in the different growth cycles from a seedling to the 12 m height of climbing economic plants, the height and the irradiation angle of a hung plant lamp need to be adjusted can be solved; and according to the LED plant growing lamp, overall operation is convenient, adjusting and detaching are convenient, the effect is obvious, and the economic effect is obvious.