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The asynchrony of the polar SDSS~J085414.02+390537.3 was revealed using thedata of ZTF photometric survey. The light curves show a beat period $P_{beat} =24.6 \pm 0.1$~days. During this period the system changes its brightness by$\sim 3^m$. The periodograms show power peaks at the white dwarf's rotationperiod $P_{spin} = 113.197 \pm 0.001$~min and orbital period $P_{orb} = 113.560\pm 0.001$~min with the corresponding polar asynchrony $1-P_{orb}/P_{spin} =0.3\%$. The photometric behavior of the polar indicates a change of the mainaccreting pole during the beat period. Based on the Zeeman splitting of theH$\beta$ line, an estimate of the mean magnetic field strength of the whitedwarf is found to be $B = 28.5\pm 1.5$~MG. The magnetic field strength $B\approx 34$~MG near the magnetic pole was found by modeling cyclotron spectra.Doppler tomograms in the H$\beta$ line demonstrate the distribution of emissionsources typical for polars.

SDSS J085414.02+390537.3 -- a new asynchronous polar