HERD is the High Energy cosmic-Radiation Detection instrument proposed to operate onboard Chinas space station in the 2020s. It is designed to detect energetic cosmic ray nuclei, leptons and photons with a high energy resolution ($sim1%$ for electrons and photons and $20%$ for nuclei) and a large geometry factor ($>3,{ m^2,sr}$ for electrons and diffuse photons and $>2,{ m^2,sr}$ for nuclei). In this work we discuss the capability of HERD to detect monochromatic $gamma$-ray lines, based on simulations of the detector performance. It is shown that HERD will be one of the most sensitive instruments for monochromatic $gamma$-ray searches at energies between $sim10$ to a few hundred GeV. Above hundreds of GeV, Cherenkov telescopes will be more sensitive due to their large effective area. As a specific example, we show that a good portion of the parameter space of a supersymmetric dark matter model can be probed with HERD.
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