Automatic positioning method for shifting fork of synchronizer of electric drive speed changing box

The invention discloses an automatic positioning method for shifting fork of synchronizer of electric drive speed changing box, and the method comprises the steps of determining the position of the positive and negative ends, positive synchronization point position, negative synchronization point position and dead center position as the target position of shifting fork of synchronizer at off-line state; correcting position of shifting fork of synchronizer at off-line state; storing the target position of shifting fork of synchronizer; having on-line deviation compensation for the position of shifting fork of synchronizer while comparing the position of the shifting fork of synchronizer obtained by automatic positioning operation with the stored target position. The automatic positioning method for shifting fork of synchronizer of electric drive speed changing box can avoid the positioning difference of the electric drive speed changing box synchronizer for the vehicle on the road for a long time caused by abrasion and the other reasons.