Modularized buoyancy control device and system

The invention provides a modular buoyancy control device and system, and relates to the technical field of buoyancy control equipment, and the device comprises a main body which is of a circular truncated cone-shaped structure as a whole; the hasp assembly is arranged at the top of the main body and is used for buckling and mounting equipment needing buoyancy control; and the ballast assembly is arranged in the main body and used for controlling the overall buoyancy of the main body. According to the control device, the device body can be rapidly installed at the bottoms of workpieces of various shapes through the hasp assemblies, and a modular installation mode is provided so that the control device can be rapidly matched with various workpieces to be installed and assist in submerging; and secondly, stable assisting and driving effects can be provided in the floating and diving processes through the ballast assembly, when rapid floating is needed, the floating force can be rapidly increased through cooperat