The invention is applicable to the technical field of solar cells, and provides a solar cell preparation method and a solar cell module. The method comprises: dividing a textured substrate into N doped regions, and setting intrinsic regions between adjacent doping regions; doping the doped regions of the substrate to prepare N sub-cell units, wherein positive and negative electrodes of the adjacent sub-cell units are opposite; doping a front surface and a back surface of the same doped region in the substrate with impurities of opposite impurity types, and doping the same surfaces of the adjacent doped regions in the substrate with impurities of opposite impurity types, wherein the impurity types include P-type impurities and N-type impurities; cleaning the doped substrate, and performingpassivation treatment; printing gate lines on the front surface and the back surface of the passivated substrate, and connecting the N sub-cell units in series. The solar cell preparation method can increase the output power of the solar cell module.