The invention discloses a furrowing and sowing machine and a sowing method thereof. At present, grain and vegetable sowing machines used by Chinese farmers in the fields universally sow seeds under traction of tractors, are applicable to sowing operation in a large area and cannot adapt to greenhouse planting. The furrowing and a sowing machine comprises a first earth leveling wheel, a frame, a furrowing mechanism, a hub motor, a second earth leveling wheel, a support armrest, an earth scraping plate, a sowing mechanism and a stepping motor, the sowing mechanism comprises a roller, a supporting plate and a sowing component, and the furrowing mechanism comprises a driving synchronous belt pulley, a synchronous belt, a driven synchronous belt pulley, an electromagnetic clutch, a crank, a T-shaped sliding rod, a sliding rail, a cross rail, a furrowing plough, a slider and a cross shaft. According to the furrowing and sowing machine, sowing line spacing and sowing spacing of seeds can be controlled according to requirements, and furrowing depths can be adjusted in real time, so that the furrowing and sowing machine has higher adaptability to lands with different hardness.