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We report the results of an experimental study of dc and low frequenciesmagnetic properties of K$_{0.8}$Fe$_{2}$Se$_2$ single crystal when the dcmagnetic field is applied parallel to the $\bf{ab}$ plane. From the dataobtained, we deduce the full H-T phase diagram which consists of all threeH$_{c1}$(T), H$_{c2}(T)$ and H$_{c3}(T)$ critical magnetic field plots. The twoH$_{c1}$(T) and H$_{c2}$(T) curves were obtained from dc magnetic measurements,whereas the surface critical field H$_{c3}$(T) line was extracted by acsusceptibility studies. It appears that near T$_c$, the H$_{c3}$(T)/H$_{c2}$(T)ratio is $\approx 4.4$ which is much larger than expected.

Superconducting critical fields of K$_{0.8}$Fe$_{2}$Se$_2$ single crystal