Pit baking oven

The utility model discloses a pit baking oven. The pit baking oven comprises an oven body, wherein a sealing cover plate is arranged at the upper part of the oven body; a hearth and a grate are arranged in the oven body; an air door is arranged at the hearth; and a liner which is made of a material capable of absorbing heat and releasing heat is arranged in the oven body. According to the pit baking oven, a comburent is added into the hearth to heat the liner of a pit bin at first, then a fire source in the hearth is closed, food is placed into the pit bin, and then the heat absorbed by the liner of the pit bin is released to heat the food, so that the baked food is clean and sanitary, contains no peculiar smells or harmful substances, is safe and reliable, and has a unique flavor.