The invention discloses a 
metal roof rustproof waterproof repairing paste, which comprises, by weight, 65-70 parts of water, 2.0-4.0 parts of an aqueous 
pigment dispersing agent, 8-18 parts of ash 
calcium powder, 8-18 parts of 
titanium dioxide, 60-90 parts of 
zinc phosphate, 25-50 parts of aluminum tripolyphosphate, 450-600 parts of an 
emulsion, 250-350 parts of heavy 
calcium powder, 5.5-8.5 partsof anti-flashrust aid, 3.0-5.0 parts of a 
defoamer, 2.0-3.5 parts of an anticorrosion agent, and 4.0-6.0 parts of a rheological aid. According to the present invention, the 
metal roof rustproof waterproof repairing paste can form the firm 
protection layer using 
iron phosphate as the main body, and the 
protection layer is densely passivated and insoluble in water so as to provide good anti-
rust effect; and the 
emulsion has advantages of good elasticity, good flexibility and good 
weather resistance, cannot subjected to 
thermal expansion and cold contraction, can 
resist crack, and can form the dense hydrophobic film during the 
drying so as to provide good waterproof effect.