An LED lamp for photosynthesis of plants comprises a lower blade with a curved face； a light board installed on the curved face； a plurality of LEDs disposed on the light board, projecting light in various directions； an upper blade disposed on the lower blade, wrapping the light board and the plurality of LEDs； and a stem body connected to one of the lower blade and the upper blade. The plurality of LEDs of the invention can project light in various directions to illuminate various leaves of potted plants. Therefore, various leaves can obtain enough light to conduct photosynthesis.
