Oil well cement low-temperature composite early-strong coagulation accelerator

The invention discloses an oil well cement low-temperature composite early-strong coagulation accelerator. The coagulation accelerator is prepared by mixing the following inorganic/organic components in parts by weight: 0.5 to 1 part of inorganic salt, 0.5 to 2 parts of organic salt, 0.04 to 0.1 part of organic amine, and 0.1 to 0.5 part of organic acid; wherein the inorganic salt is a mixture of calcium sulfate and sodium silicate; the organic salt is one or two of calcium formate, calcium oxalate, sodium acetate, and iron lactate; the organic amine can be diethanolamine, triethanolamine, or methanamide; and the organic acid is formic acid or oxalic acid. The provided coagulation accelerator has the advantages of low production cost and good early-strong effect, and also has a certain coagulation accelerating effect. The coagulation accelerator is suitable for international A-grade/G-grade oil well cement, and can be co-used with weighting materials (iron ore powder, barite powder, etc.) or lightening materials (fly ash, floating beads, etc.) to prepare cement mortar with different densities according to the needs.