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This invention discloses a method for preparing silver paste for a mobile phone speaker diaphragm, belonging to the field of mobile phone acoustic component preparation technology. First, a compound binder is placed in a constant-temperature stirrer, and a toughening agent is added. The mixture is stirred for 40-50 minutes at 70-90°C and a stirring speed of 500-510 r / min, resulting in a binder-toughening agent mixture. Next, based on this mixture, a compound solvent is added to adjust the viscosity of the mixture at 25°C to 5000 mPa·s. The viscosity is then measured using an NDJ-1 rotational viscometer at a rotation speed of 60 r / min. The test was conducted under the conditions of / min and shear rate; and after adjustment, the temperature of the mixing system was reduced to 50-60℃, and stirring was continued for 20-30 minutes for curing treatment, and the cured bonding system was output; based on this, the present invention optimizes the entire process of silver paste preparation, adds a special toughening agent to the bonding system, and fully integrates the toughening agent and the binder through constant temperature curing treatment, which effectively improves the brittleness of the silver paste after film formation, and at the same time precisely adjusts the viscosity and thixotropy of the silver paste to adapt to the ultra-thin characteristics of the diaphragm and the application scenarios of high frequency reciprocating vibration.