Rapeseed sower and sowing method by using sower

The invention relates to a rapeseed sower and a sowing method by using the sower. The sower comprises a machine frame, a sowing assembly and a traveling assembly, wherein the sowing assembly comprises a seed falling box, seed falling pipes and seed falling guide sleeves; the traveling assembly comprises traveling roller wheels and a rolling mechanism; the rolling mechanism is positioned at the front end of the sowing assembly in the traveling direction of the rapeseed sower; the rolling mechanism comprises a pressure plate and rolling wheels; the pressure plate is fixed to the machine frame; and the bottom surface of the pressure plate is aligned with the corresponding sowing surface of the rapeseed sower. The pressure plate is provided with a row of the rolling wheels which perform compaction on the sowing surface and form rolling grooves as the rapeseed sower travels, the quantity of the rolling wheels is corresponding to the quantity of the seed falling guide sleeves; and the rolling grooves formed by the