The invention relates to the field of materials, in particular to a three-phase conducting composite material. An aqueous polypyrrole conducting polymer with good conductivity and water-soluble performance is prepared; the aqueous polypyrrole conducting polymer is used as a conducting filler to be added into a cement base body together with a carbon nano tube; the composite material with good conductivity, self sensing performance and mechanical performance is obtained. The mass ratio of aqueous polypyrrole to cement is 1:(800 to 5000); the mass ratio of the carbon nano tube to the cement is (0.8 to 1.2):(1300 to 1500); the aqueous polypyrrole is obtained from pyrrole monomers through aqueous polymerization. The aqueous polypyrrole and the carbon nano tube are jointly added into the cement base body; a space conducting network of a polypyrrole-carbon nano tube dual conducting channel is formed; the electrical conductivity is improved by 5 to 7 times than a cement base composite material with the same carbon nano tube content; the cost is low.