A continuous-carbon-nanotube-fiber-reinforced resin-based composite material, a wind turbine blade, and a preparation method therefor. The continuous-carbon-nanotube-fiber-reinforced resin-based composite material comprises a resin matrix and continuous carbon nanotube fibers incorporated into the resin matrix. The wind turbine blade is formed by stacking multiple pieces of the continuous-carbon-nanotube-fiber-reinforced resin-based composite material. The wind turbine blade has good mechanical properties; the strain of the carbon nanotube fiber composite material can be monitored in real time; and the competitiveness and safety of the wind turbine blade and a fan product are improved.
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