The invention discloses a conductive aluminum paste for a back passivation solar cell. The conductive aluminum paste comprises various components having following weight percentages: 70-80% aluminum powder, 0.5-5% inorganic glass, a 1-15% organic carrier and a 0.1-10% tensile force additive. The tensile force additive is uniformly dispersed in the conductive aluminum paste, molecular bridges can be built between interfaces of inorganic and organic substances when the conductive aluminum paste is sintered, and the two kinds of materials with great disparity in nature are connected together to improve performance of a composite material and increase bonding strength, so a tensile force of the conductive aluminum paste is formed in the condition that a back field passivation layer is not damaged, the process defective rate of follow-up assemblies is reduced then, and photoelectric conversion efficiency of the cell is improved.