The invention belongs to the technical field of solar cell preparation, in particular to a method for preparing a low-cost high-efficiency laminated solar cell. The present invention comprises the following steps in sequence: texturing, pn junction formation, tunneling silicon oxide deposition, phosphorus element doping, annealing, passivation layer growth, patterned opening, conductive layer deposition, electron transport layer formation, perovskite Film formation, hole transport layer formation, antireflection layer formation and electrode preparation. The solar cell prepared by the present invention has a stacked cell structure, which greatly improves the conversion efficiency of the cell, and the top cell of the present invention adopts a very low-cost perovskite cell, and the bottom cell adopts a high-efficiency passivation contact cell , the key and expensive preparation process of the whole battery is all realized by ultra-low-cost printing or spin-coating or ink-jet methods of various chemical slurries, thus greatly reducing the manufacturing cost while greatly improving the conversion efficiency of the battery , which is conducive to large-scale industrial application and realizes parity Internet access.