The invention belongs to the field of underwater main control over deep-sea work type ROVs, and particularly relates to a control system and a control method for a deep-sea work type ROV. The control system comprises a monitoring layer, a control layer, an execution layer and a public data layer, wherein the monitoring layer comprises an information processing module, an equipment communication module and an equipment state monitoring module, and the control layer comprises a resource allocation module, a task decision-making module, a task control module and an instruction output module. According to the control system and the control method for the deep-sea work type ROV, a VxWorks embedded real-time operation system is applied, ensures the real-time processing of multiple ROV tasks due to high performance, and is good in stability and high in expansibility; the structure is simple, the tasks of all parts are clear, operation is efficient, the tasks are distinct in gradation, and the system is convenient to maintain; the control system and the control method for the deep-sea work type ROV are good in universality and can be widely applied to deep-sea work type ROV control systems.