Abstract: A file encryption and transmission method and apparatus are provided. The method includes: acquiring a set of files to be transmitted; generating, for file information of each file in the set of files to be transmitted, a key string by using a first preset algorithm; compressing and encrypting, by using the key string, the set of files to be transmitted to obtain an encrypted file; encrypting the key string by using a prefabricated encryption machine to generate an encrypted string; transmitting, through a network, the encrypted file, the encrypted string and an information file to a destination end; and executing, by the destination end, a decryption operation based on the encrypted string and the encrypted file to acquire a decrypted file, and performing integrity check on the decrypted file based on the file information.