On the basis of optimized formulation of polyurethane cement waterproof coating，TiO₂ was added to develop a new type of high weather resistance polyurethane/TiO₂-cement composite waterproof coatings. The coating surface morphology was characterized byscanning electron microscope，the water absorption rate was tested and tensile strength before and after treatment of UV，alkali solution，and high-temperature were measured. The resultsshowed that the properties of the composite waterproof coatings met the requirements of theGB/T 23445—2009 standard. When the mass fraction of TiO₂ was 0. 4%，the composite waterproof coating exhibited the best UV aging resistance（tensile strength retention rate of 117. 7% and the elongation retention rate at the break of 76. 2%），good alkali aging resistance and heat aging resistance，and lower water absorbing rate.