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Brightening of Hen 3-860, previously classified as an H$\alpha$ emitter, wasdetected by the ASAS-SN survey at the end of the year 2016. We have obtainedthe first spectroscopic observations of the transient and supplemented themwith photometric data from the DASCH archive of astronomical plates, ASAS andASAS-SN surveys. Based on the results of our analysis, we can classify theobject as a classical symbiotic star of the infrared type S, consisting of anM2-3 giant with $T_{\rm g}$ $\sim$ 3 550 K, a radius $R_{\rm g}\sim$ 60 - 75R$_{\odot}$, and a luminosity $L_{\rm g}\sim$ 540 - 760 L$_{\odot}$, and a hotand luminous component ($T_{\rm h}$ $\sim$ $1-2 \times 10^5$ K and $L_{\rm h}\sim 10^3 \rm L_\odot$). The system experienced at least four outbursts in thelast 120 years. In addition to the outbursts, its light curves revealed thepresence of eclipses of the hot component and its surrounding (relatively cool)shell, which developed during the outburst and redistributed a fraction of theradiation of the hot component into the optical, by the giant, classifying theobject as a representative of a group of eclipsing symbiotic stars. Theeclipses allowed us to reveal the orbital period of the system to be 602 days.

Hen 3-860: New southern eclipsing symbiotic star observed in the outburst