Device and method for buoyancy adjustment of deep sea glider

The invention discloses a device for buoyancy adjustment of a deep sea glider. The device for buoyancy adjustment of the deep sea glider comprises an internal oil tank, a two-way hydraulic pump, a first switch valve, a second switch valve, a third switch valve, a direct current motor, a one-way valve, an external oil sac, a motor controller, an air pressure sensor, a temperature sensor, a controller, an integrated valve block, a pair of synchronous belt pulleys, a synchronous belt, a support and an air sac. The axis of the internal oil tank coincides with the axis of the external oil sac, the internal oil tank and the external oil sac are arranged in the lower positions of the two ends of the support respectively, the air sac is arranged in the internal oil tank, the first switch valve, the second switch valve, the third switch valve and the one-way valve are installed on the integrated valve block, the integrated valve block, the direct current motor and the two-way hydraulic pump are fixedly installed at the end, close to the external oil sac, of the support, the two synchronous belt pulleys are installed on an output shaft of the direct current motor and a driving shaft of the two-way hydraulic pump respectively, and the two synchronous belt pulleys are connected through the synchronous belt. The device for buoyancy adjustment of the deep sea glider can solve the technical problems that an existing buoyancy adjusting device is poor in quality, large in size, large in energy consumption and low in adjusting capacity.