The invention relates to a production method for suede woolen knitted trouser fabric without pilling. The production method comprises a material selecting process, a spinning process, a yarn steaming process, a knitting process, a shearing process, a shaping process and a post-finishing process, wherein in the material selecting process, long wool strips with length of 60mm-100mm are utilized, in the spinning process, four fibers are formed into yarns by adopting of a mode of doubling and jointing after single twisting; the yarn steaming time is prolonged to 1.5 hours; milling is performed before shearing for the first time; after milling, naps with different lengths are milled; after the first-time shearing, the suede is uniformly controlled to proper height and not easy to pill; in the shaping process, the temperature is 180 DEG C, the cloth inlet speed is 20m/minute, and overfeeding rate is +15%, and the internal stress of the fabric can be eliminated very well. In this way, the material selecting process, the spinning process, the shearing process and the shaping process of the raw materials are comprehensively improved, so that the balling-up and the shrinking almost reach the requirements of the suede knitted trouser fabric.