The invention provides an endurable cement concrete pavement slab bottom injecting paste material and a preparing method thereof. The endurable cement concrete pavement slab bottom injecting paste material is prepared from cement, pulverized fuel ash, a water reducing agent and water, and is further prepared from a compound A, a compound B and a complexing agent. The compound A is prepared from, by weight, 60%-70% of precipitated silicon dioxide, 5%-10% of asbestos and 20%-30% of attapulgite, and the sum of the weight percentages of the raw materials is 100%; the compound B is prepared from, by weight, 80% of sepiolite, 5%-10% of super absorbent resin and 10%-15% of magnesia expansive agent, and the sum of the weight percentages of the raw materials is 100%. The endurable cement concrete pavement slab bottom injecting paste material is quick in gelling, high in water-dispersion-prevention performance, large in fluidity and high in permeability, can permeate into a solidified soil bodyand a pavement base layer or into an interface with a certain quantity of active mineral materials, the viscosity and stability are high, the rheological loss of slurry can be lowered, the anti-freezing and anti-permeability performance is high, and the corrosion resistance is high under the effect of snow melting salt.