Disclosed is a no-tillage combined precision sowing machine; a suspended landing gear and a gearbox are arranged on a girder; a cutter shaft, a cutter head and blades are arranged below the girder; the machine is characterized in that the blades are in a flat and straight shape along the longitudinal direction; the horizontal distance between the blades at both sides of the cutter head is 8-12 cm; a fertilizer box, a fertilizer feeder, a seed box and a seed-metering device are respectively arranged on the girder from the front to the back; a fertilizer furrower is arranged on the girder and in front of the seed-metering device; a transmission shaft and a wheel carrier are arranged at the rear part of the girder; a suppression wheel is arranged on the wheel carrier; the suppression wheel is connected with the transmission wheel through a primary chain drive mechanism; the transmission shaft is connected with the fertilizer feeder and a drive wheel for the seed-metering device through asecondary chain drive mechanism; and a soil seal device is arranged in front of the suppression wheel on the girder. The no-tillage combined precision sowing machine can simultaneously complete a setof operating procedures including high-straw stubbing, furrowing, fertilizing, sowing, soil covering and suppressing and has high sowing efficiency; the machine does not damage the soil structure andis high in seed germination rate; besides, the machine protects the environment and can effectively prevent desertification.