The invention belongs to the technical field of automatic control and particularly relates to a control device and method for automatic butt joint of underwater dragging carriers at sea. The control device comprises a driving signal sending device, a comprehensive display and control device, a winch control device, an underwater control device, a posture sensor, a voice signal processing device, a voice base array, a driven signal receiving device and a sound beacon. According to the but joint method, butt joint of longitudinal underwater dragging carriers can be fast, accurately and automatically achieved through automatic or manual control with the control device. Operation is simplified, and the automation degree and the visualization degree are improved.