The invention relates to a method for retreading the old porcelain brick wall by the paint, a retreading decorative layer composed of a interface binder layer (2), a first polymer cracking-resistant putty layer (3), a second polymer cracking-resistant putty layer (4), a glass fiber girding cloth (5), a third polymer cracking-resistant putty layer (7), a double-component flexible putty layer (9), a smooth surface putty layer (9), a seal coat layer (10), a middle coating layer (11), a flexible silicone-acrylate latex paint layer (12) and a fluoric-carbon coating varnish layer (13) is formed on the old wall surface porcelain brick of the old wall (1), an anchor nail (6) passes through the glass fiber gridding cloth (5), the second polymer cracking-resistant putty layer (4) and the first polymer cracking-resistant putty layer (3) and is embedded in the old wall (1) for the mechanical reinforcement, all layers above are dried and solidified and are integrated with the old wall (1) firmly to complete the retread of the old wall surface. The construction cost and the labor strength are low, the old porcelain brick on the wall surface can not fall off, the decorative is high.