The invention discloses a data credible transmission method in power remote meter reading. The method comprises the following steps that 1, terminal passwords are introduced into remote meter readingterminals, when mounting is carried out, the terminal passwords are set for the terminals, and the terminal passwords are stored in the terminals and a charging center database; 2, after the remote meter reading terminals generate meter reading data, through combination of the terminal passwords and the metering read data, SHA256 operation is carried out, thereby obtaining digests; 3, when the remote meter reading terminals transmit data, messages comprising the digests and the meter reading data are transmitted back to a charging center, and the terminal passwords are not transmitted; and 4,after the charging center receives the messages, through combination of the locally stored terminal passwords and the meter reading data in the messages transmitted back by the remote meter reading terminals, the SHA256 operation is carried out, and results are compared with the digests in the messages transmitted back by the remote meter reading terminals. The method is high in data tampering prevention capability and ingenious in design, is easy to apply and is applicable to the communication industry.