The utility model discloses a positioner and have this positioner's single phase power can terminal automatic checkout device, positioner, including interconnect's horizontal part and vertical portion, erect the cross -section and appear for L, it has the fixed orifices to open on the horizontal part, the front below of vertical portion is equipped with the location inclined plane, the location inclined plane inclines to make the bottom width of vertical portion to be less than the width at top from top to bottom. Horizontal part through positioner makes fixing on the crossbeam that positioner can be firm, and positioner's vertical portion is then can be earlier realize the location with the contact of electric energy terminal tray with electric energy terminal tray, then the electric energy terminal fixes a position the position about the electric energy terminal when pushing to show support portion to, the test needle of the alignment table support portion that the firm energy terminal can be accurate, improvement detection accuracy and detection efficiency.