The peeler consists of a unilateral system, a peeling assembly and a power train. There are a fruit holler, a reciprocate peeling seat and a controller to make up the peeling assembly. While operation, the controller does a sequent function step by step. Through the process, it makes all the operation cyclically. During processing, the unilateral supply mechanism makes a simple and uninterrupted feeding. The holler does the fruit holding and rejecting without orient and the reciprocal seat runs repeat, also. The controller may reset by the fruit size to minimize the stroke.