The invention discloses dual-function electric conduction silver paste for a touch screen and a preparation method and application thereof. The silver paste can meet the requirement for the two touch screen preparation technologies of silk screen hairline printing and laser ablation at the same time. The silver paste comprises, by weight, 60%-73% of micron order flaky silver powder, 5%-10% of nano silver powder, 15%-20% of organic carriers, 1%-9% of function auxiliaries and 1%-5% of functional filler. The manufacturing method of the paste includes the carrier synthesis step and the silver paste preparation technology step. The electric conduction silver paste obtained through the method can powerfully adhere to an ITO (In2O3:SnO2) thin film or a glass base material in a medium and low temperature curing mode, the damage of thermal stress to the ITO thin film and an adhesive layer is effectively avoided, and production energy consumption is lowered; a cured silver paste electrode has a good electrical property, and the interface contact resistance between the silver paste electrode and the ITO layer is low. Compared with traditional touch screen silver paste, the production efficiency of the silver paste is effectively improved, the silk-screen line width is stable, laser ablation is clean, the yield is high, and the production cost of the touch screen is lowered obviously.