The invention provides a servo power supply which is applied to an electromechanical servo system and belongs to the electromechanical field. The servo power supply source comprises a lithium battery pack (1) and a power supply management unit (2). The power supply management unit (2) is composed of a main control unit (2.1), a monomer voltage detection unit (2.2), a battery equalization management unit (2.3), a battery thermal management unit (2.4) and a peak compensation unit (2.5). The lithium battery pack (1) provides a power supply required by the electromechanical servo system. The power supply management unit (2) carries out peak current compensation and regeneration energy absorption, and carries out system management and equalization on the lithium battery pack (1). The servo power supply provided by the invention can work for a long time, can be reused, has the advantages of large capacity, high reliability, low cost and small volume, can absorb regeneration energy, can carry out large pulse discharge, and is especially suitable for an aerospace servo power supply system.