Introduce the general design and layout characteristics of a 3500t self-propelled self-elevating wind turbine installation unit, determine the main equipment performance parameters based on the wind power construction process requirements, and focus on innovative content in the design and layout of cranes and jacking system. According to the latest effective regulations of the Maritime Safety Administration and classification society, fire prevention and escape route design are carried out, in order to provide reference for the general design of similar wind turbine installation unit.