Objective To develop a new type of highly efficient composite scale and corrosion inhibitor for oilfield produced water treatment. Methods A composite scale and corrosion inhibitor was prepared using bis(hexamethylene triamine penta(methylene phosphonic acid)), sulfonic acid copolymer and sodium tungstate as raw materials. By the static scale inhibition test and dynamic corrosion test, the scale and corrosion inhibition performance were investigated at different mass concentrations of the composite scale and corrosion inhibitor. The influences of flocculant, corrosion inhibitors and bactericide on scale inhibition were studied. Results The scale inhibition rate was over 95% and the corrosion inhibition rate was 0. 0696 mm/ a in the oilfield produced water treatment when the optimal mass concentration of the scale and corrosion inhibitor was 30 mg/ L. The excess of flocculant and quaternary-ammonium-salt 1227 bactericide in oilfield produced water caused decrease in the scale inhibition rate. Imidazoline corrosion inhibitor had synergistic effect on the scale inhibition rate, while bactericide isothiazolone had little effect on the rate of scale inhibition. Conclusion The composite scale and corrosion inhibitor had the advantages of simple preparation process as well as excellent scale and corrosion inhibition performance.