Rhenium has excellent physical and chemical properties, and has important applications in aerospace and military fields as ultra-high temperature structural material and surface cooling coating. There are many preparation methods for Re coating, but the mainstream preparation technology has high deposition temperature and corrosive atmosphere, which corrodes most refractory metal substrates. As a result, the mainstream preparation technology can not obtain dense and well-bonded Re coating on refractory metal and alloy substrate surface, which makes its application in high temperature protection of refractory metal surface limited. The preparation technology of Re coating under mild conditions is expected to solve this problem. This paper reviews the research status of Re coating preparation methods under three mild conditions: aqueous electrodeposition, MOCVD and EBPVD. The preparation processes and typical structure characteristics of Re coating by different methods are summarized, and the future research direction is prospected.