The present invention is a technique for determining a failure of a resolver sensor used to determine the position of a rotor of a resolver. The control board makes a determination of a failure using a microcomputer without a resolver-digital converter, There is provided a resolver failure determination device and method capable of determining whether or not there is an abnormality in the signal average value or whether there is an abnormality in the resister value or not and whether there is a malfunction in the signal deviation value or not. The resolver failure determination method according to an embodiment of the present invention includes sensing a signal output from the resolver, calculating an average value and a deviation value of the sensed signal, and calculating a mean value and a deviation value using the calculated average value and the deviation value, Judging whether the resolver is open or short-circuited.
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