The invention discloses a printable environment-friendly credential card body. The printable environment-friendly credential card body is characterized in that the printable environment-friendly credential card body is of a symmetrical composite layer structure, is formed in a hot-pressing way, and sequentially comprises a PET (polyethylene terephthalate) film heat transfer printing processing layer, a PET protective support layer, a PET esterification reaction layer, a PETG (polyethylene terephthalate glycol) connecting layer, a PETG printing layer, a PETG core material layer, a PETG printing layer, a PETG connecting layer, a PET esterification reaction layer, a PET protective support layer and a PET film heat transfer printing processing layer from top to bottom. The printable environment-friendly credential card body is reasonable in structure, easy to operate, environment-friendly, attractive in appearance and high in anti-counterfeiting performance, and credentials can be made and printed on the spot; the card body is high in firmness, high in physical and chemical stability and image accuracy and detail expression, and has good personalized printing effects; after the credentials are synthesized, the credentials have high wear resistance and durability, technical indexes of peeling, torsion, bending and the like completely meet legal credential making standards and requirements, and the potential safety hazard that personal information on the credentials is falsified and replaced is completely eradicated; and the card body has an actually adhesive-free card body structure, and is high in finished product ratio and environment-friendly.