The cast-in-place plastic formwork is used in the prefabrication of cement such as urban pipe corridors and pile foundations. The plastic formwork is environmentally friendly and energy-saving, economical and economical through bad regeneration, and waterproof and corrosion-resistant. It also has many advantages, such as: smooth and smooth, tight and smooth formwork splicing, the surface structure and finish of the concrete structure after demoulding exceed the technical requirements of the existing clean water formwork, no secondary plastering, saving labor and materials; stable and durable , High mechanical strength, under the temperature of -20 ° C to + 60 ° C, no shrinkage, no swelling, no cracking, no deformation, stable size, alkali resistance, corrosion resistance, combustion, water resistance and rodent and insect resistance. The advantages of reduced cost, high turnover, low use cost, etc. now include culvert chamfering template, wall template, inner corner template and outer corner template.