Provided are an injectable long-acting analgesic pharmaceutical composition, a preparation method therefor, and an application thereof. The pharmaceutical composition comprises an active drug, a drug solvent, a drug solubilizer; a medicinal slow-release agent, a drug effect enhancer, an optional antioxidant, and an optional acid-base regulator. The pharmaceutical composition has a controllable release behavior and a slow-release effect, can significantly reduce the peak plasma concentration of the drug, and improve the medication safety. The pharmaceutical composition can prolong effective treatment time, reduce an effective therapeutic dose, increase a drug utilization rate, and reduce a toxicity risk due to drug accumulation, has a long-acting analgesic effect, and can be used in pain treatment.
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