The invention provides self-power-generation power compensation equipment in travelling. The rotation speed of an engine is measured by utilization of a rotation speed sensor, so that the instantaneous output power of a generator under driving of the engine is calculated; a power supply selection control circuit is connected to the generator, an energy storage unit and a plurality of sets of voltage-stabilizing and flow-equalizing circuits; when the output power of the generator is greater than requirements of a rear-level load, the power supply selection control circuit supplies power to the rear-level load through the plurality of sets of voltage-stabilizing and flow-equalizing circuits, and simultaneously, charges the energy storage unit; and, when the output power of the generator cannot satisfy the requirements of the rear-level load, the generator and the energy storage unit supply power to the rear-level load at the same time. By means of the self-power-generation power compensation equipment in travelling provided by the invention, uninterruptible and steady power supply of rear-level equipment in the whole travelling process can be ensured; therefore, the use time of a standby power supply can be greatly reduced; and the service life of the standby power supply is prolonged.