The invention discloses a solar evacuated tube collector for heat exchange in a micro-channel. The micro-channel comprises a glass tube, a micro-channel tube bundle, a liquid return tube, a gas collecting cavity, a liquid collecting cavity, a gas guide tube and a liquid guide tube which form a separating type circulating tube together with an external condensation section, wherein a circulating working medium capable of generating gas-liquid phase change within the heat-collecting temperature area range is filled into the separating type circulating tube, and the filling amount of the circulating working medium is 10 to 90 percent of the inner volume of the separating type circulating tube, so that the circulating working medium has a stable airlift pump effect in the micro-channel. In the solar evacuated tube collector, by utilizing the high heat transfer efficiency and unique airlift pump effect of the micro-channel, the heat transfer efficiency of a solar collector is improved, the weight of a heat absorption body in the conventional evacuated tube solar collector is reduced, and the heat-collecting temperature is improved, so the expansion of the application temperature area range and the application occasion range of the evacuated tube solar collector is facilitated.