An incinerator pre-fill chamber for installation on an incinerator for burning combustible material which allows the operator to continuously re-fill the container of the incinerator with new combustible material while the contents within the container is burning. The incinerator pre-fill chamber includes an elongated case having a first opening aligned in sealing relationship with a second opening disposed in the lid of the incinerator such that when said pre-fill chamber is mounted on the incinerator lid the combustible material can pass from said pre-fill chamber through said first and second openings. The pre-fill chamber further includes a plunger with a platen, at least one side door that opens for loading the material to be burned into the pre-fill chamber, and a trap door that opens when the plunger is actuated thereby permitting the material to pass through the first opening of the pre-fill chamber.