The invention belongs to the technical field of mine field geophysics, and particularly relates to an inter-well sonic wave logging system. The logging system can complete inter-well sonic wave measurement work for neighboring open-hole wells, realize the measurement and description of sonic characteristics of strata between adjacent two wells or multiple wells, and in turn, provide assistance forreflecting the physical properties of inter-well reservoirs and determining the heterogeneity and the connectivity and trend of the reservoirs. The inter-well sonic wave logging system includes an inter-well sonic wave transmitting device, an inter-well sonic wave receiving device and an inter-well synchronization device. The inter-well sonic wave transmitting device is composed of a ground transmitting station and a tandem down-hole transmitting instrument group. The tandem down-hole transmitting instrument group includes a transmitting communication line, a transmitting line and a sonic wave transmitting system. The inter-well sonic wave receiving device is composed of a ground receiving station and a tandem down-hole receiving instrument group. The tandem down-hole receiving instrumentgroup includes a receiving communication line, a receiving line and a sonic wave receiving system. The inter-well synchronizing device includes a ground synchronization module and a down-hole synchronization module.