The invention discloses a cement reinforcer which comprises the following components in parts by weight: 8-18 parts of zeolite powder, 15-22 parts of precipitated barium sulfate, 8-12 parts of talcum powder, 30-38 parts of diatomite powder, 13-21 parts of borax, 9-14 parts of acrylamide, 9-21 parts of calcium lignosulphonate, 4-7 parts of sodium acetate, 9-18 parts of ethylene glycol, 2-4 parts of urea, and 48-62 parts of water. The relative density of the cement reinforcer disclosed by the invention is 1.12-1.21, which is much smaller than the density of cement paste, so that an anti-fluid-channeling effect can be achieved on the premise of not changing the density of cement paste; according to the invention, composite cement concrete has the functions of heat insulation, heat preservation, insulation, resistance, and the like, so that artificial maintenance can be omitted; because after the reinforcer is added, the reinforcer is expanded and produces a dynamic reverse reaction to the solidification of cement, duo to the expansion operation, the strength of cement and the cementing strength of cement with other media are significantly improved, and cement also can be saved by 28-36%; and according to the invention, the heat produced in the process of solidification caused by a chemical reaction between cement and water is reduced by about 50%, thereby achieving an anti-crack effect.