The invention provides a convenient-to-operate grounding device of electromagnetic compatibility circuit. The device comprises a mounting frame, an anti-skid pad, a mounting bases, mounting holes, a supporting frame, a vertical supporting seat, a transverse frame, a cooling fan, an internal thread mounting hole, a conductive column and a grounding wire, wherein the left surface of the mounting frame is glued with the anti-skid pad; the upper end and the lower end of the mounting frame are connected with the mounting bases through bolts, and the mounting holes are formed in the mounting bases; and one end of the supporting frame is in bolted connection with the right lower side of the mounting frame. Through the arrangement of a mounting table body, a fixed lining seat, an internal threaded hole, an adjusting screw rod, a movable clamping seat and an adjusting cap, electromagnetic compatibility circuit equipment can be conveniently mounted and fixed, and operation is convenient; and the electromagnetic compatibility circuit equipment is arranged on the upper part of the mounting table body, and the adjusting screw rod is directly adjusted to rotate in the internal threaded hole in the fixed lining seat by holding the adjusting cap, so the movable clamping seat is propped against the electromagnetic compatibility circuit equipment, and the electromagnetic compatibility circuit equipment is convenient to install, fix and operate.