Composite oil field anti-hydrogen sulfide bactericide as well as preparation method and application thereof

The invention provides a composite oil field hydrogen sulfide-resistant bactericide and a preparation method and application thereof, the hydrogen sulfide-resistant bactericide comprises a component A and a component B, the component A is a bactericidal component, the component B is a hydrogen sulfide-resistant agent, and the mass ratio of the component A to the component B is (1-2): (1-3). Dodecyl dimethyl benzyl ammonium chloride adsorbs negatively charged bacteria through ionized cations and gathers on cell walls, a room resistance effect is generated and has a good killing effect on TGB and FB, and polyhexamethylene guanidine hydrochloride solves the problem that dodecyl dimethyl benzyl ammonium chloride is not ideal in SRB sterilization effect in an adsorption and wrapping suffocation mode. Therefore, harmful bacteria such as SRB, TGB and FB in produced water can be effectively killed; the 1, 3, 5-tri (ethoxyl)-hexahydro-s-triazine can react with hydrogen sulfide in the produced water, sulfur element coa