The invention belongs to the technical field of electric and automation, particularly relates to a method for encryption of a software engineering file, and specifically relates to a method for encryption and decryption of an intelligent electric meter embedded engineering file. The method includes preprocessing the intelligent electric meter embedded engineering file, converting the embedded engineering file into numeric characters, and then performing encryption and decryption operation of the intelligent electric meter software engineering file on the basis of using an elliptic curve to encrypt preprocessing, thereby guaranteeing confidentiality of the intelligent electric meter embedded engineering file of a submission unit, improving intellectual property security of an intelligent electric meter submission company, and reducing intelligent electric meter embedded software transmission and storage risks brought by the Internet. The method provided by the invention reduces the data length of a secret key, thereby reducing time consumption and resource consumption of encryption, reducing the calculation amount of encryption, and improving the encryption speed of the intelligent electric meter software engineering file.