The invention discloses high-conductivity low-shrinkage-rate front electrode silver paste for a solar cell and a preparation method for the silver paste. The front electrode silver paste comprises thefollowing components: nano-silver particles, silver molybdate, sodium oxide, foamed aluminum, sodium carbonate, manganese dioxide, zinc oxide, barium oxide, terpineol, hydrogenated castor oil, citricacid, lead-free glass powder and modified lauryl polyoxyethylene ether, wherein the modified lauryl polyoxyethylene ether is prepared by mixing silicon dioxide, lauryl polyoxyethylene ether and chitosan; and the porosity of the foamed aluminum is 25-35%. The lauryl polyoxyethylene ether is subjected to modification treatment, so that the conductivity of the silver paste is improved. The low-porosity foamed aluminum is mixed with other components, so that the shrinkage rate of the obtained silver paste is reduced, the compatibility between the front electrode silver paste and a base material is improved, the adhesive force is high, the environmental pollution is small, the shrinkage rate in high-temperature curing is low, the false welding is not easy to cause, and the product rejection rate is low.