Preparation method of antibacterial agent, thermoplastic resin composite material and preparation method of thermoplastic resin composite material

The invention discloses a preparation method of an antibacterial agent, a thermoplastic resin composite material and a preparation method thereof, and relates to the technical field of high polymer materials. The preparation method of the antibacterial agent comprises the following steps: S10, adding silver nitrate, magnesium nitrate and citric acid into water, and stirring to obtain a mixed solution; S20, dropwise adding a sodium hydroxide solution into the mixed solution until the pH value of the mixed solution is 6-8, and carrying out a stirring reaction at 70-90 DEG C to obtain a reaction solution; S30, filtering the reaction solution to obtain a solid A, and washing, drying and calcining the solid A to obtain a solid C; and S40, mixing the solid C, water, dioctadecyl dimethyl ammonium bromide, ammonia water and tetrabutyl titanate, carrying out a stirring reaction, filtering to obtain a solid B, and washing, drying and calcining the solid B to obtain the antibacterial agent. The prepared antibacterial ag