Online transaction idempotence method and device

The invention relates to the technical field of online transaction idempotence, and discloses an online transaction idempotence device, which comprises a transaction idempotence detection table, a transaction validity detection module and a transaction idempotence control module, and also discloses an online transaction idempotence method, which comprises the following steps: S11, querying the transaction idempotence detection table; S12, searching the record of the current transaction serial number; S13, registering a transaction state, a processing result and a response message; S14, judging the cause of registration operation failure; S15, querying the transaction idempotent check table again; S16, judging a transaction state; and S17, returning a message that the transaction is changed right or a response message. According to the invention, a transaction idempotent detection table, a transaction effective detection module and a transaction idempotent control module are arranged, so that association relat