The utility model discloses an automatic conveyer's of metal thermos cup accurate positioning mechanism of secondary, the on -line screen storage device comprises a base, conveyor rail, be equipped with the sliding seat on conveyor rail, the middle part of sliding seat is equipped with the thermos cup fixing base, the sliding seat side is equipped with the V -arrangement groove, lateral part at conveyor rail is equipped with sliding seat locating component, sliding seat locating component includes the base member, the ejector pin, positioning roller, when waiting that it places in the thermoscup fixing base to process the metal thermos cup, the once location of metal thermos cup is waited to process in the realization, remove when predetermineeing the position when the sliding seat, the V-arrangement inslot is gone into at the sliding seat locating component's of corresponding department positioning roller card to the setting, the accurate location of secondary of metal thermos cup is waited to process in the realization. The utility model discloses an automatic conveyer's of metal thermos cup accurate positioning mechanism of secondary not only can convey another station from astation with the metal thermos cup of treating processing, can the accurate positioning wait to process the metal thermos cup moreover, improves work efficiency and processing precision.