The invention discloses a bidirectional seeder which comprises a main rack, a rail car rack, electric rail wheels, a bidirectional rotary cultivator, a fertilizer box, a seed box, a first pulling rod, a main rotary shaft, a second pulling rod, a control valve, a flow direction shaft, a flow guide sheet, a Y-shaped pipe, a first seed pipeline, a first fertilizer pipeline, a second seed pipeline, a second fertilizer pipeline, a first seeding leg, a second seeding leg and a soil baffle. The bottom of the seed box and the bottom of the fertilizer box are arranged together side by side and evenly provided with a plurality of outlets. The control valve is mounted on the outlets, an upper branch pipe of the Y-shaped pipe is connected with the outlets of the seed box and the fertilizer box, the first pulling rod is mounted on the outer wall of the fertilizer box through the main rotary shaft, and the lower end of the first pulling rod is connected with the second pulling rod through a rotary shaft. The flow direction shaft is mounted at the top end of the Y-shaped pipe, the lower end of the second pulling rod is fixedly connected with the flow direction shaft, and the flow guide sheet is fixedly mounted on the flow direction shaft. The bidirectional seeder has the advantages of being safe and environmentally friendly, and improving seeding efficiency.