Novel multipurpose small underwater glider

The invention provides a novel multipurpose small underwater glider. The unmanned aerial vehicle comprises a head cabin, a buoyancy cabin, a battery cabin, a control cabin and a tail cabin which are connected in sequence, an electronic device is arranged in the control cabin, a camera is installed in the head cabin, a battery is arranged in the battery cabin, a rudder blade is arranged in the tail cabin, the battery is a movable mass sliding block, and the control cabin is connected with the rudder blade. The buoyancy cabin pumps and drains water through a plunger pump to change the buoyancy of the glider so as to play a role in floating and diving, so that the glider runs at a stable attack angle in the floating and diving process; based on a control instruction output by the electronic equipment, the positions of the rudder blade and the battery are adjusted, and image acquisition of underwater work is completed. The device achieves the effects of being small in size, easy to carry and maintain, multifuncti