The invention relates to strontium-containing injectable bone cement and a preparation method thereof. The strontium-calcium composite bone cement comprises the following solid phases: tetracalcium phosphate, monetite crystal whiskers, strontium hydrogen phosphate and calcium sulfate hemihydrate, and the following liquid phases: water for injection or polyvinyl alcohol, and polyethylene glycol. The solid phases and the liquid phases are separately mixed, and then solid mixture and liquid mixture are uniformly stirred and mixed in solid-liquid mass ratio of (2-3):1, so that the strontium-calcium composite bone cement is obtained. Through hydration and solidification, the final product, namely the strontium-calcium composite bone cement of calcium sulphate and strontium doped apatite, is prepared, initial strength of the bone cement can be enhanced due to needle-like morphology of monetite crystal whiskers, resistance to collapse due to water is good, degradation rate is adjustable, the bone cement does not collapse in a human body, morphology of the bone cement after solidification is of a laminate shape and rod-shaped crystals are adhered, the bone cement can be completely degraded, degradation rates of calcium sulphate and strontium-containing apatite are different, mechanical properties of the bone cement can be maintained, and repairing of coloboma in clinical application can be realized.