Pipelining data transmission method and data pipeline device

A data buffer method and a device are provided. The device includes an upstream module, a downstream module and a buffer circuit which includes a plurality of storage units coupled between the upstream module and the downstream module. The data buffer method includes: performing a plurality of write/read rounds on the buffer circuit. Each of write/read rounds further includes: performing a write operation on the buffer circuit in a writing order by the upstream module and performing a read operation on the buffer circuit in a reading order by the downstream module. The writing order and the reading order in the same write/read round are different.