The invention discloses an oceanic earthquake data transmission unit. The unit comprises a control module, a power supply module and a communication module, the control module is used for parsing andsending a control command and conducting arrangement on collected earthquake data, the power supply module provides electric energy for the data transmission unit, and the communication module executes the control command and transmits the earthquake data. By adopting the data transmission unit, data arrangement and transmission are conducted, and high data transmission efficiency and accuracy areachieved, which is beneficial for obtaining good ocean survey information.