The invention discloses a mixer for a cement-based composite material with ultra-high toughness and a use method of the mixer. The mixer comprises a support. A mixing tank with openings in two ends is horizontally arranged on the support, and is driven by a first driving mechanism to rotate. A plurality of lifting plates are obliquely arranged on the inner wall of the mixing tank, a center shaft is horizontally arranged in the mixing tank, and a plurality of mixing teeth are arranged on the outer wall of the center shaft. The mixer has the beneficial effects that the mixing tank can be used for mixing common concrete; the cement-based composite material with ultra-high toughness can be mixed through the arrangement of the mixing teeth on the center shaft and the lifting plates, and fibers and the common concrete can be mixed evenly; meanwhile, compared with mixing of other concrete with ultra-high toughness, mixing efficiency is high; and the mixing teeth are arranged on the center shaft in a plum blossom shape, therefore, the fibers can be evenly mixed in a mortar base body, and the mixing efficiency of the mixer can be improved.