A method of waterproof and floor construction by using thixotropic urethane and fabric sheet includes the steps of applying a primer on a base concrete surface to form a primer layer; disposing waterproof fiber sheets on the primer layer with an interval in the range of 5 to 10 mm and connecting the intervals with tapes to form a fiber sheet layer; applying thixotropic urethane having viscosity in the range of 900,000 to 1,000,000 CP onto the fiber sheet layer; and spraying super high speed hardening type resin onto the thixotropic urethane to form a coating layer.