Tea plastic composites were prepared using recycled polypropylene (RPP) as matrix, with the addition of tea powder, Nano-TiO2 and ammonium polyphosphate (APP). The effects of tea powder and Nano-TiO2 content on the properties of tea plastic composites were investigated. The results showed that proper amount of tea powder can improve the tensile strength of RPP, and when the tea powder mass fraction was 10%, the tensile strength was increased by 26.1%. Nano-TiO2 can improve the tensile strength of tea plastic composite and slow down the decrease of tensile strength in the process of thermal aging, thus improving the weather resistance. The synergistic effect of Nano-TiO2 and APP on the flame retardant performance of tea plastic composite was investigated. The results showed that the synergistic effect of Nano-TiO2 and APP can further reduce the horizontal burn rate of tea plastic composite. When the mass fraction of Nano-TiO2 was 4%, the horizontal burn rate of the composite was the lowest at 23.3 mm/min, which is 40.6% lower than that of the composite without Nano-TiO2. When the mass fraction of Nano-TiO2 was fixed at 4% and the amount of APP was changed, the horizontal burn rate of the composite was only 20.2 mm/min when the mass fraction of APP was 15%.