The invention discloses a dual-power mechanism applied to a high-precision numerical control machine tool. The dual-power mechanism comprises a sleeve, a connecting shell fixedly connected with the sleeve, a second main shaft sleeved with the sleeve and an output shaft. A third gear and a fourth gear which are engaged with each other are arranged in the connecting shell in a paired manner. The second main shaft is a lead screw and is sleeved with a displacement block body. The displacement block body is connected with the second main shaft through a screw nut. The displacement block body is connected with the sleeve through a first guide mechanism. The guide direction of the first guide mechanism is the same as the length direction of the sleeve. The displacement block body is connected with a moving piece of the first guide mechanism. An annular step concentric with the displacement block body is arranged on the displacement block body. The outer portion of the second main shaft is sleeved with the output shaft. An end groove is formed in the driving end of the output shaft and connected with the annular step through a bearing. A second guide groove extending in the axis direction of the output shaft is formed in the output shaft. The fourth gear is matched with the second guide groove through a key and connected to the outer portion of the output shaft in a sleeving manner.