The invention discloses a synergistic composition containing an organic silicon plant growth regulator, and relates to the field of agriculture. The invention mainly aims to solve the problem that plants using a single plant growth regulator at present can generate drug resistance and the like. The synergistic composition comprises a component A, a component B and a component C, the component A and the component B are active components, and the component C is an auxiliary agent. The active component A accounts for 0.01%-90% of the mass of the composition, and the active component B accounts for 0.001%-90% of the mass of the composition. The active component A is silicon abundance ring, and the active component B is one or more of brassinolide, benzylaminopurine, diethyl aminoethyl hexanoate, choline chloride, ethephon and triacontanol. The auxiliary agent is any one dosage form permitted in pesticide, which is prepared from a conventional surfactant, a solvent, a cosolvent, a solid filler and the like permitted in pesticide preparation. The composition has the advantages that the resistance problem caused by single use of two single agents can be delayed, and a crop yield is improved.