The active star-forming region W33B is a source of OH and H_2_O maser emission located in distinct zones around the central object. The aim was to obtain the complete Stokes pattern of polarised OH maser emission and to trace its variability and to investigate flares and long-term variability of the H_2_O maser and evolution of individual emission features. Observations in the OH lines at a wavelength of 18cm were carried out on the Nancay radio telescope (France) at a number of epochs in 2008-2014; H_2_O line observations (long-term monitoring) at {lambda}=1.35cm were performed on the 22m radio telescope of the Pushchino Radio Astronomy Observatory (Russia) between 1981 and 2014.