The invention provides a hydroxyl carboxyl salt type retarder for cement of an oil well as well as a preparation method and a use method thereof. The hydroxyl carboxyl salt type retarder for the cement of the oil well is prepared from the following components in percentage by weight: 25 to 30% of hydroxyl carboxyl salt, 35 to 40% of acrylic acid type polymer, 20 to 25% of sodium sulfate, and the balance of calcium carbonate. The hydroxyl carboxyl salt type retarder has the advantages that the hydroxyl carboxyl salt type retarder is suitable for medium and low temperature range of 40 to 90 DEGC; the thickening time is easy to prolong, and the construction requirements can be met; the influence to the early strength of cement stone is smaller; the hydroxyl carboxyl salt type retarder can beused as a dispersant to improve the fluidity, and reduce the viscosity; the sensitivity is reduce, and the mixing operation is convenient. The obtained cement slurry system has the excellent comprehensive properties of broad temperature use range, long medium and low-temperature thickening time, high strength, short transition time and the like.