For the issues that the openloop control system of the column cylinder of the original screw pile hammers had unstable performance,the manual operation was poor realtime and the synchronization error of the cylinder was large, the synchronous closedloop control system based on PLC was designed and used in the new type of screw pile hammers.The hardware of the closedloop control system consisted of a column cylinder, a magnetostrictive displacement sensor, and a S7200 programmable controller from SIEMENS.The field experimental results show that the designed closedloop control system of the column cylinder can be used to achieve the digital control of the column, and automatical correction in lifting and falling process. The synchronous control precision is ±2 mm, the control system is stable, safe and convenient, and has practical engineering value.