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In this paper, a novel perovskite solar cell (PSC) with a triple absorber layer is numerically simulated using Solar Cell Capacitance One-Dimensional software (SCAPS-1D). The initial simulation of the structure (FTO/TiO2/CsSnI3/CsSnGeI3/Cs3Sb2Br9/Spiro-OMeTAD/Au) reveals that by combining Cesium Tin Triiodide (CsSnI3), Cesium Tin-Germanium Triiodide (CsSnGeI3) and Cesium Antimony Bromide (Cs3Sb2Br9) as triple absorber layer, we obtain a higher efficiency {31.81%} than the single (CsSnI3), and double (CsSnI3/CsSnGeI3) layer structures, whose efficiencies are 12.87% and 29.41%, respectively. Then, to optimize the proposed structure, different parameters like; thicknesses of the triple absorber layer, different materials of ETL (electron transport layer) and HTL (hole transport layer), thicknesses of ETL & HTL, as well as the operating temperature have been investigated. The optimized structure (0.4/0.1/0.1 µm of CsSnI3/CsSnGeI3/Cs3Sb2Br9 as triple absorber layer; 0.1 µm of tungsten trioxide WO3 as ETL and 0.35 µm of Copper(I) Oxide Cu2O as HTL, as well as an optimum temperature of 300 K) shows a remarkable photovoltaic parameters i.e., JSC = 32.640774 mA/cm2, VOC = 1.2442 V, FF = 89.17% and η = 36.21% (which corresponds to an improvement of 4.4% compared to the initial proposed structure {31.81%}). This study’s simulation results open a better route toward fabricating highly efficient perovskite solar cells