The invention discloses a cart for tray transfer. The cart is characterized by comprising a cart body, a horizontal rectangular supporting panel is arranged over the cart body, and vertical upward surrounding plates are arranged on three edges of the upper surface of the supporting panel, so that the supporting panel and the surrounding plates jointly form a box body with the upper end and one side being of an open structure; a battery tray transferring station used for containing a battery tray is formed in the box body, and the open side of the box body is a battery tray placing end; and a supporting panel vertical translation control mechanism is arranged between the cart body and the supporting panel, and can drive the supporting panel to horizontally move in the vertical direction. The cart has the advantages that the use is more convenient, and the cart can be more conveniently placed on a battery delivery trolley body and can better transfer the battery tray.