The invention provides a power device with a regulation error prevention function, which comprises a shell. The shell is internally provided with an upper cavity chamber and a lower cavity chamber; the upper cavity chamber and the lower cavity chamber are segmented through multiple arrayed separator parts; the separator part comprises an upper separator and a lower separator overlapped vertically; the upper separator is in sliding connection onto the inner wall of the shell; the lower separator is in sliding connection onto the inner wall of the shell; the upper separator and the lower separator form a V-shaped structure under an overlook angle; an abut joint mounting cavity is arranged between the upper separator and the lower separator; the mounting cavity is internally provided with an electromagnet; and the upper separator and the lower separator are connected via the electromagnet. The technical problem of low accuracy and influenced safety for the error prevention device in the prior art can be solved.