The invention discloses a mould-proof and anti-algae functional wood-plastic composite. The mould-proof and anti-algae functional wood-plastic composite is prepared from raw materials in parts by mass as follows: 100 parts of a thermoplastic plastic substrate, 40-140 parts of modified wood fiber powder, 0.2-6 parts of mould-proof active substances, 0.5-6 parts of anti-algae active substances, 6-30 parts of activated calcium carbonate, 2-5 parts of a lubricant, 1-6 parts of a coupling agent and 2-15 parts of other processing aids, wherein the modified wood fiber powder is subjected to UV irradiation modification treatment. By means of the UV irradiation modification for wood fiber and addition of the mould-proof active substances and the anti-algae active substances, mould resistance and algae resistance of the wood-plastic composite are effectively improved, and the wood-plastic composite has broad-spectrum and high-efficiency mould-proof property and anti-algae property.