The invention relates to a cement adhesive with low energy consumption and super-early strength for binding of an insulator and a preparation method thereof. The cement adhesive is prepared from the following raw materials of quick-hardening cement, common cement, micro-silicon powder, binding quartz sand, a composite admixture and water, wherein the composite admixture consists of a retarder, a polycarboxylate superplasticizer, an early strength agent, a tackifier and a defoamer according to a ratio. The cement adhesive has the beneficial effects that (1) the production efficiency of the insulator is greatly improved by the compounding of the quick-hardening cement and the common cement; (2) the strength stability, anti-seepage property and durability are excellent; (3) by adopting the proper tackifier, the water sensitivity is decreased, the viscosity of the cement adhesive is adjusted, and the operability of the cement adhesive is obviously improved; (4) the binding time of the adhered insulator is greatly shortened, and the utilization rate of a curing tank is improved; (5) by adopting the three-step mixing method, the ratio of premixture to the quick-hardening cement is properly adjusted, so as to maintain the actual condensing time and operation time of the cement adhesive.