The invention provides an active anti-blocking no-tillage planter using a cutaway disc harrow, which comprises a fertilizer box, a seed box, a fertilizer discharging chain wheel, a gear box, a cross beam, a cutaway disc harrow, a furrow opener, a press wheel, a chain wheel and a spring of the press wheel, a gap-bridge chain wheel, a seed discharging tube, a fertilizer discharging pipe, a seed discharging chain wheel and the like, wherein, the diameter of the cutaway disc harrow is 400mm, and the rotation speed thereof is 400rpm; and the furrow opener is a shovel-type furrow opener provided with arc-shaped grooves, and the cutaway disc harrow is located in the arc-shaped grooves with the superposition distance between the cutaway disc harrow and the furrow opener being 36mm, thereby achieving the shearing function, preventing straw from being wound around the furrow opener and ensuring better anti-blocking ability. The no-tillage planter is capable of conducting the operations, such asstubble cleaning, rotary tilling, fertilizer burying, seeding, pressing and the like, at the same time in one step for going to the fields. Therefore, the no-tillage planter is particularly suitable for seeding the heavy rice-stubble fields in Jianghuai and Jiangnan areas and has the advantages of lower power consumption and higher passing performance.