Side-pumped Yb-doped double-clad fiber laser is studied with a novel technology of fiber-angle-polished side-coupler. In experiments, multimode fibers with small polished-angle end by advanced technics are acquired and the precision mechanical adjustments is used to aim the polished-angle multimode fiber end at the double-clad fiber side accurately. Several kinds of index-matching materials are adopted for research to find that the index-matching materials are critical to launching power and coupling efficiency in this kind of side-couplers. The fiber-angle-polished side-coupled technology is adopted to inject maximal pumping power of 1.12 W into double-clad fiber, and the highest coupling efficiency acquired is even near 80%. Using the side-coupled to pump a CW side-pumped Yb-doped double-clad fiber laser, maximum output power of 282 mW and slope efficiency of 55.5% are obtained by one pigtail laser diode pumping source. The experimental results demonstrate fiber-angle-polished side-coupling technology is a simple and efficient pumping way for Yb-doped double-clad fiber laser.