Pump driving device

The invention provides a pump driving device. Currently, a known technology is as follows: a reciprocating driving type pump is installed in a soil disinfection device, while driving by a wobble crank, an adjusting rod linked with a wobbling pivot is operated in sliding, thereby quickly changing an extrusive quantity, but a problem that a pivot position of the wobbling pivot cannot be correctly returned to an original pivot position when returning back to an original extrusive quantity after changing the extrusive quantity is caused. In the pump driving device of the invention, the adjusting rod (44) comprises a first moving body (54) which slides along length direction of the wobble crank (40) and can be locked with a locking body (56)at a multi-stage position, and a second moving body (55) which slides along the first moving body (54) and can be locked with the first moving body (54) at a non-stage position, moreover, a pivot cam (41) is linked with one end of the second moving body (55), and the other end