Compound plugging agent for oil well water control and preparation method of compound plugging agent

The invention relates to a compound plugging agent for oil well water control and a preparation method of the compound plugging agent. The preparation method comprises the following steps: adding water into a reactor, adding one or two of acrylic acid, N, N-methylenebisacrylamide and polyethylene glycol diacrylate while stirring until complete dissolution is achieved, slowly adding micron-sized granular montmorillonite or/and kaolin, after montmorillonite or/and kaolin is uniformly dispersed, dropwise adding ammonium ferrous sulfate and hydrogen peroxide, reacting for 1 hour at room temperature, finally adding sodium hydroxide for neutralizing to be neutral to obtain floccules and carrying out centrifugal drying on the floccules to obtain a nano(micro)-sized water-control compound temporary plugging agent. The temporary plugging agent can be used as a water-control temporary plugging agent in refracturing, plug removal and acidizing measures of old oilfields subjected to waterflooding development, the temporary plugging agent is injected from the oil well of which the moisture content is 20-40% to plug dominant waterflooding channels in medium-moisture-content and high-moisture-content oil wells and thus the purpose of measure water control in the medium-moisture-content and high-moisture-content oil wells is achieved.