Abstract: To improve the mechanical properties and thermal insulation properties of glazed hollow bead/cement foamed thermal insulation composite, the modified physical foam was added in foamed thermal insulation composite to reduce the density and thermal conductivity of the composite, and modified fibers were adopted to reinforce the performance of foamed thermal insulation composite. The mechanical properties and water resistance of fiber reinforced foamed thermal insulation composite were studied, and the internal micro-morphology of samples was observed by SEM. The improving mechanism of modified foam and modified fibers on foamed thermal insulation composite were explored. The results show that, mixing foam decreases the density and thermal conductivity of foamed thermal insulation composite significantly, when the content of foam is 1.05 mL/g, the density and the thermal conductivity of samples are 186 kg/m³ and 0.056 W/(m·K) respectively. The modified foam can effectively improve the strength and softening coefficient of foamed thermal insulation composite, compared with samples mixed with latex powder, the flexural strength, compressive strength and softening coefficient of samples mixed with modified foam increase by 21.05%, 21.43% and 13.56% respectively. Modified fibers can significantly improve the strength and softening coefficient of samples, the flexural strength, compressive strength and softening coefficient of samples mixed with modified fibers increase by 25.93%, 13.51% and 8.33% respectively than the samples mixed with unmodified fibers.