The invention relates to a small-waterplane two-body type high-performance water area unmanned inspecting device which is provided with a long-distance autonomous cruising function, can finish water surface detection work, is made of glass steel materials, and adopts power-driven outboard motor power and a novel control system. The device has good seakeeping performance, a twin-hull ship is divided into a water upper part and a underwater submerged body; the water upper part is provided with water surface monitoring equipment; underwater monitoring equipment can be arranged on a deck surface and extended into water for monitoring through a lifting rod. The device is made of glass steel materials and adopts power-driven outboard motor power, features good operation and leaves out a rudder system, thus enjoying convenient maintenance and replacement; in addition, the power-driven outboard motor is most suitable for shore-based remote control driving; by adopting a novel control system, a dispersion control system taking a computer microprocessor as the basis, a control system of a programmable logic controller and wireless data communication marinization, the inspection device of the invention can carry out remote management and control on a monitoring ship through a human-computer interface.