The disclosed universal paint tray cart has a top surface for setting various sizes of paint trays on, wheels for moving the universal paint tray cart and one or more paint tray coupling devices. Each paint tray coupling device is coupled to a slot opening in the universal paint tray cart body. Each paint tray coupling device has a first end that is coupled to the slot opening of the universal paint tray cart, and a second end which couples to a paint tray. The paint tray coupling devices hold the paint tray to the universal paint tray cart so that the cart and the paint tray can be moved about without the paint tray falling off of the universal paint tray cart. The paint tray coupling devices slide along the length of the slot openings to adjust to the size of the paint tray being held.