The invention provides a receiving channel automatic leveling method and a judging method and a leveling system thereof with the automatic leveling condition and belongs to the field of blank pipe onboard anti-collision systems. A standard signal source is generated in a receiving machine, and difference between amplitude values measured when signals of a standard signal source pass each receiving channel is kept in the set error range by adjusting the configuration parameters of a receiving machine. Manual operation and equipment matching are saved, leveling accuracy and leveling efficiency are improved, the channel leveling requirement is met before equipment delivery, and equipment installation out-field maintenance requirement can be met.