The invention discloses tenacity anti-fluid-channeling cement slurry for a solid expansion pipe fixed well. The tenacity anti-fluid-channeling cement slurry comprises the following components: 100g of a mixture of G-level oil well cement or G-level cement and silica powder ( when the static temperature of the bottom of the well is more than 110 DEG C), 2.5g-4.2 g of a delaying coagulating agent, 8g-11g of a fluid loss agent, 1g-1.2g of a dispersing agent, 0.5g-0.8g of a toughening agent, 3g-5g of an anti-fluid-channeling agent, 0.1g-0.3g of an antifoaming agent, and 37.3g-41g of tap water, wherein the toughening agent is formed by mixing fiberglass the length of which is 0.3-2mm and polyamide fiber the length of which is 3-5mm according to the mass ratio of 2:1, and the other matters are sold in a market. The cement slurry provided by the invention has the advantages that the cement slurry has the strong sealing property and good comprehensive property, can ensure that a solid expansion pipe is safely and reliably expanded and improve the sealing quality of a cement ring of the solid expansion pipe, and supplements the defects and disadvantages of the prior art.