Black and odorous water body purification device and purification method

The invention provides a black and odorous water body purification device and method, the device comprises a suction dredger, a plurality of rotating discs are arranged at one end of the suction dredger in the width direction of the suction dredger in an array mode, and each rotating disc is provided with a first protruding part and a second protruding part; the containing disc comprises an upper disc and a lower disc, the upper disc and the lower disc are connected through a connecting column and used for containing the bricks arranged in the string in a penetrating mode, and a first limiting hole and a second limiting hole which are matched with the first protruding part and the second protruding part are formed in the bottom of the lower disc; the mud suction mechanism is used for sucking bottom mud of the black and odorous water body; the method comprises the steps of bottom mud salvaging, brick manufacturing, brick biofilm culturing, brick penetrating, brick putting and brick biofilm culturing and puttin