We propose an extension of multi-pomeron exchange model for the description of production of strange particles. The model [1-3] describes consistently multiplicitiy, transverse momentum and their correlation in wide energy range (from ISR to LHC) by introducing string collectivity effects in pp collisions. The particles discrimination is implemented according to Schwinger mechanism. We present the results on strange particles yields and their transverse momentum and discuss the influence of higher resonances on these observables.