The utility model discloses an ocean bottom seismic detecting device, ocean bottom seismic detecting device bury in deep -sea sediment, can guarantee equipment and seabed effective coupling, and seismic signal can not lead to the distortion because of the defective coupling, effectively having reduced the ocean current and having washed away the equipment noise that arouses, the seismic signal SNRis higher, and effectively deal with the equipment that the fishery activity leads to and lose the risk, be provided with releasing mechanism and pneumatic pop -up mechanism, can realize the automatic of ocean bottom seismic detecting device and retrieve labour saving and time saving, still be provided with mechanical pop -up mechanism, can further make the seismic detection appearance break awayfrom first casing fast, float to the surface of water, realize retrieving.