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Context: The SW Sex stars are assumed to represent a distinguished stage inCV evolution, making it especially important to study them. Aims: We discovereda new cataclysmic star and carried out prolonged and precise photometricobservations, as well as medium-resolution spectral observations. Modellingthese data allowed us to determine the psysical parameters and to establish itspeculiarities. Results: The newly discovered vataclysmic variable2MASSJ22560844+5954299 shows the deepest eclipse amongst the known nova-likestars. It was reproduced by totally covering a very luminous accretion disk bya red secondary component. The temperature distribution of the disk is flatterthan that of steady-state disk. The target is unusual with the combination of alow mass ratio q~1.0 (considerably below the limit q=1.2 of stable masstransfer of CVs) and an M-star secondary. The intensity of the observed threeemission lines, H_alpha, He 5875, and He 6678, sharply increases around phase0.0, accompanied by a Doppler jump to the shorter wavelength. The absence ofeclipses of the emission lines and their single-peaked profiles means that theyoriginate mainly in a vertically extended hot-spot halo. The emission H_alphaline reveals S-wave wavelength shifts with semi-amplitude of around 210 km/sand phase lag of 0.03. Conclusions: The non-steady-state emission of theluminous accretion disk of 2MASSJ22560844+5954299 was attributed to the lowviscosity of the disk matter caused by its unusually high temperature. The starshows all spectral properties of an SW Sex variable apart from the 0.5 centralabsorption.

2MASSJ22560844+5954299: the newly discovered cataclysmic star with the deepest eclipse