To provide a drive controlling method for the crushing machine which has a simple arrangement, eliminates light clogging of the crushed product automatically and improves the working efficiency.

The method comprises a driving pressure detecting step A10 of detecting the driving pressure of the side conveyer, excessive load-determining steps A20 and A70 of determining whether or not the side conveyer remains excessively loaded based on the driving pressure detected in the driving pressure detecting step A10 and a conveyer reversion controlling step A110 of driving the side conveyer reversely when the side conveyer is determined to remain excessively loaded in the excessive load-determining steps A20 and A70.