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The implications of the fourth generation quarks in theB-->K_{1}(1270,1400)l^{+}l^{-} with l=mu, tau decays are studied, where themass eigenstates K_{1}(1270) and K_{1}(1400) are the mixture of ^{1}{P}_{1} and^{3}{P}_{1} states with the mixing angle \theta_{K}. In this context, we havestudied various observables like branching ratio (BR), forward backwardasymmetry (A_{FB}) and longitudinal and transverse helicity fractions (f_{L,T})of K_{1} meson in B-->K_{1}l^{+}l^{-} decays. To study these observables, wehave used the Light Cone QCD sum rules form factors and set the mixing angle\theta_{K}=-34^{o}. It is noticed that the BR is suppressed for K_{1}(1400) asa final state meson compared to that of K_{1}(1270). Same is the case when thefinal state leptons are tauons rather than muons. In both the situations allthe above mentioned observables are quite sensitive to the fourth generationeffects. Hence the measurements of these observables at LHC, for the abovementioned processes can serve as a good tool to investigate the indirectsearches for the existence of fourth generation quarks.

K_1(1270)-K_1(1400) mixing and the fourth generation SM effects in B-->K_1l^+l^- decays