Аннотация:CCD UBVRI photometry is presented for SN2020mmz spanning 170 days of evolution. The dates and magnitudes of maximum light in different photometricbands and the parameters of the light curves are determined.The maximum luminosity and general behaviour of the light curves aretypical for the class SN II-L, the peculiar feature of SN2020mmzis the fast brightness decline for the first 20 days after maximum.