Improved self-propelled grain combine-harvester

The utility model relates to an improved self-propelled grain combine-harvester comprising a harvester frame, a header, an engine, an operator cabin, a grain tank, a threshing device, a cleaning device, a seed lifting device and a self-loading device, wherein, the threshing device is composed of a front flow cutting cylinder and a rear flow cutting cylinder; the utility model also comprises an impurity collection device, an impurity lifting device and a stalk collection device; the impurity collection device is composed of a lower vibration sieve, an isolation plate and an impurity collection slot; the impurity lifting device is composed of a lower-horizontal conveying packing auger for impurities, a conveying device of an impurity lifting scraping plate, and an upper-horizontal conveying packing auger for impurities, which are mutually connected in series. The lower-horizontal conveying packing auger for impurities is arranged in the impurity collection slot; the upper-horizontal conveying packing auger for impurities is arranged above the front flow cutting cylinder; the stalk collection device is composed of a straw stripper, a straw walker and a stalk connection tank which are connected in series and are arranged behind of the threshing device. The utility model has the characteristics of good threshing effect, small seed damage loss and a high grain unloading opening; the utility model can be used for recovering crop stalks.