The invention relates to the technical field of centrifugal chillers, in particular to a double-machine head centrifugal chiller system. The double-machine head centrifugal chiller system comprises a first centrifugal compressor intake valve (1), a second centrifugal compressor intake valve (2), a first centrifugal compressor exhaust valve (3), a second centrifugal compressor exhaust valve (4), a first centrifugal compressor gulp valve (5), a second centrifugal compressor gulp valve (6), a first bypass valve (7), a second bypass valve (8), a first throttle valve (9), a second throttle valve (10), a first centrifugal compressor (11), a second centrifugal compressor (12), a first evaporator (13), a second evaporator (14), a first condenser (15), a second condenser (16), a first power saver (17), a second power saver (18), a first centrifugal compressor intake pipe (19) and a second centrifugal compressor intake pipe (20). The system is simple in design, easy to operate, stable, reliable and easy to be installed, cleaned and maintained.