The invention relates to a conductive paste for the surface electrode of a solar cell, which comprises conductive metal powders, organic carriers, adhesives, solvents and addition agent, wherein, the conductive paste also comprises additives which are selected from phosphorus pentachloride and one or more VIII group metal halide. The additive in the conductive paste of the invention can help improve the adhesive force between the conductive paste and silicon substrate, and lead adhesion between compounds obtained after electrode sintering and silicon substrate to be more firm; the formed compound does not have cracks and bubbles and the electrode surface is flat and smooth, thus providing the solar cell finally prepared with higher photoelectric conversion efficiency.