The invention discloses C80 ultrahigh pumping concrete and a preparation method thereof. The C80 ultrahigh pumping concrete is prepared from the following raw materials in parts by weight: 270 to 310parts of cement, 690 to 720 parts of sand, 950 to 990 parts of broken stone, 240 to 260 parts of a mineral admixture, 8.5 to 10.5 parts of a polycarboxylate superplasticizer, 25 to 56 parts of graphite powder, 10 to 20 parts of coal gangue ultrafine powder, 0.0145 to 0.145 part of an air entraining agent, 2.4 to 2.6 parts of an exciting agent, and 135 to 147 parts of water. The preparation methodcomprises the following steps weighing the cement, the sand, the broken stone, the fly ash, the zeolite powder, the graphite powder, the mirabilite, the slaked lime and the coal gangue ultrafine powder in corresponding parts by weight, uniformly stirring and mixing to obtain a first mixture, uniformly mixing water, a water reducing agent and an air entraining agent, adding the mixture into the first mixture, and uniformly stirring to obtain the C80 ultrahigh pumping concrete. The C80 ultrahigh pumping concrete provided by the invention has the advantages that the strength is ensured, the fluidity is good, and the pumping is easy.