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The present application relates to the technical fields of compound synthesis and catalysis, and particularly relates to a precursor compound for preparing a ruthenium catalyst with an oxygen-locked chain type semi-sandwich structure, an intermediate and a preparation method thereof, the precursor compound has the following general formula: wherein R1 is a p-toluenesulfonyl group or a methanesulfonyl group. The synthesis path of the precursor compound is shown as follows: The present application also provides application of the precursor compound in preparation of a key intermediate of a ruthenium catalyst. The method has mild reaction conditions (0-50 DEG C), simple operation, high yield, and the raw materials are easy to obtain, and the purification process is simple, and is suitable for industrialized production.