The invention provides a steam comprehensive utilization energy-saving device. The device comprises a steam generating device, a steam energy storage device, a temperature and pressure reducer, a condensate water storage device, tail end steam utilization devices and a core control unit, wherein the steam generating device is connected with the steam energy storage device through a steam conveyingpipe; the steam energy storage device is connected with the temperature and pressure reducer through the steam conveying pipe; the temperature and pressure reducer is connected with the tail end steam utilization devices through the steam conveying pipe; the condensate water storage device is connected with the temperature and pressure reducer through a connecting pipe; a condensate water controlunit is arranged on the connecting pipe; detectors are mounted on the steam energy storage device; a temperature and pressure measuring instrument is arranged on the steam conveying pipe, at the steam output end, of the temperature and pressure reducer; and each of the condensate water control unit, the detectors and the temperature and pressure measuring instrument is electric connection with the core control unit. The steam comprehensive utilization energy-saving device has the benefits as follows: an efficient and economical continuous production operating mode is realized, the energy consumption is reduced, the steam waste is reduced, and both energy consumption and emission reduction are realized.