The invention relates to a slave-main type marine environment detection intelligent robot. The slave-main type marine environment detection intelligent robot consists of two major parts: a water surface supporting main ship and an unmanned underwater vehicle, wherein the water surface supporting main ship comprises a hydraulic propeller, a small arm, a small arm rotating joint, a supporting plate, a wireless communication transceiver, a ship body, a docking gripper, a central processing cabin, a pre-positioned sensor, a monitoring cabin, a spring buffer layer, a big arm rotating joint, a big arm, a brachiopod rotating joint, a strong-force bracket and a long buoy; and the unmanned underwater vehicle comprises a stern rudder, a caudal fin, an air guide sleeve, a connecting umbilical cable, a vertical propeller, a clamping port, a horizontal propeller, a machine body, an inductor, a detector and a mounted platform.