A cantilever type rolling device suitable for rolling processing of thin-walled cylindrical workpieces comprises a base, a machine body, an upper working roll, a lower working roll, a working roll driving assembly, a downward pressing driving assembly, a workpiece clamping assembly and a working roll tightening tailstock, wherein the working roll driving assembly and the downward pressing driving assembly are positioned in the machine body; the downward pressing driving assembly is used for driving the upper working roll to carry out downward pressing action; the workpiece clamping assembly and the working roll tightening tailstock are mounted on the base; the workpiece clamping assembly is positioned between the machine body and the working roll tightening tailstock; a workpiece is positioned in the workpiece clamping assembly; the working roll driving assembly comprises a working roll driving motor, a driving shaft and a driven shaft; the working roll driving motor is connected with the driving shaft; the driving shaft is connected with the driven shaft through an idle gear system; the driving shaft and the driven shaft synchronously and reversely rotate; the lower working roll is mounted on the driving shaft; the upper working roll is mounted on the driven shaft; a sliding table plate is arranged on the base; and the workpiece clamping assembly and the working roll tightening tailstock are positioned on the sliding table plate.