The invention discloses a precise direct seeding device with a lateral seed guide function. The precise direct seeding device comprises a shell, a lateral seed guide pipe, a rotating shaft and a plurality of seed cavity dividing brushes, wherein the seed cavity dividing brushes are arranged in the shell; the seed cavity dividing brushes are connected to the rotating shaft, and are uniformly arranged around the circumferential direction of the rotating shaft, thereby forming a flexible buffer disk; two adjacent seed cavity dividing brushes and the inner wall of the shell form seed cavities; theside face of the shell is provided with a pipe interface; the pipe orifice of the lateral seed guide pipe is communicated with the pipe interface; the bottom of the shell is provided with a seed outlet; when the rotating shaft drives the seed cavity dividing brushes to rotate, the seed cavities passing by the pipe interface are communicated with the lateral seed guide pipe; when the seed cavitiespass by the seed outlet, the seed cavities are communicated with the seed outlet. The precise direct seeding device is simple in structure, and is suitable for changing strip seeding of quantitatively-conveyed seed stream into hole seeding; meanwhile, a lateral seed guide effect is achieved. Moreover, the situations of seed clamping and seed damage are reduced effectively, stable running of the flexible buffer disk is ensured, and the hole forming property is enhanced greatly.