The invention discloses a prepaid gas reading method. The method comprises the following steps: acquiring user information and system information; reading the relevant user information and system information: firstly, different reading intervals are adopted according to different periods: if the user balance before deduction is smaller than 0, reading is not conducted and a gas supply valve is closed, and reading is conducted if the user balance before deduction is larger than 0; secondly, automatic error correction is conducted, the previous reading is retained for comparison with the currentreading, and the current reading is discarded when the difference is much larger than the normal daily amount or the difference is negative; updating the user balance before deduction and conductingjudgement according to current system time: the next reading interval is the busy reading interval in the busy period, and the next reading interval is the leisure reading interval in the leisure period. According to the method, different reading intervals are adopted according to different busy or leisure periods, reading and deduction scientificity and accuracy are improved, and the risk of users' malicious arrearage is reduced in combination with a prepayment method.