The invention provides a high-concentration suspended substance electric-flocculation/floc separation precipitation integrated treatment device which comprises a flocculation purifier and a controller connected with the flocculation purifier, wherein the flocculation purifier is a cone-cylinder container of which the upper part is a cylinder and the lower part is a cone; a flocculation reaction region positioned in the cylinder region, a floc separation region and a floc precipitation region positioned in the cone region are arranged in the flocculation purifier; a water body guide tank and a plurality of electric-flocculation electrode sheet sets connected in series are arranged in the flocculation reaction region; the water body guide tank guides the water body to sequentially flow through the electrode sheet sets to perform multiplex flocculation; the upper part of the flocculation reaction region is provided with an air compressor and a water inlet pipe; and the controller is used for controlling the flow rate of the influent water and the working parameters of the electrolysis electrodes. The device has the advantages of compact structure, continuous process and high space utilization ratio, prolongs the contact time between high-concentration suspended substances and active substances generated by the electrolytic anode, and ensures the high-concentration suspended substance treatment effect.