The invention discloses an oil suspension. Per 100mL of the oil suspension is prepared from the following raw auxiliary materials: 14g of amoxicillin, 3.5g of potassium clavulafiate, 0.9-1.0g of a surfactant, 1.0-4.0g of a colloid protective agent, 3.0-15.0g of a suspending agent and the balance of an oil phase. Under the conditions of specific varieties and dosage proportion of auxiliary materials, the suspension prepared by the preparation method is favorable in physical stability, warming promotion property and redispersion property, and has no quality reduction situation even if being stored in an environment at a temperature of 4-60 DEG C for three months, which indicates that the quality is stable.