The invention discloses a multiple farm machinery operating chassis which comprises a chassis framework, a running mechanism arranged on the chassis framework, an engine arranged on the chassis framework, a first gear box connected with an output shaft of the engine, a hydraulic stepless speed changer with a first input belt pulley at the input end, and a second gear box with a second input belt pulley at the input end, wherein the first gear box is provided with a first output belt pulley and a second output belt pulley; the second output belt pulley is an electromagnetic clutch belt pulley; the first output belt pulley is in belt connection with the first input belt pulley, and the output end of the hydraulic stepless speed changer is connected with an input shaft of the running mechanism; the second output belt pulley is in belt connection with the second input belt pulley; the second gear box is provided with a first output shaft and a second output shaft which are used for being connected with an operating machine; an electromagnetic clutch is arranged at the end part of each of the first output shaft and the second output shaft. The farm machinery operating chassis can be matched with multiple different farm machinery operating machines, so that the utilization efficiency of power machinery is improved.