The invention relates to a production apparatus and production method of an all-natural highly-pure solid edible plant ash alkali. The production apparatus is a natural substance filter, and the natural substance filter comprises a porcelain filtering container with an open-ended superior surface, a gauze filtering layer, a quartz sand filtering layer, a palm sheet whisker filtering layer, a chicken feather vine filtering layer and a husk filtering layer. The production method comprises the following steps: sintering Schefflera arboicola with high potassium and sodium components, bamboo head and bamboo joint to form plant ash, enough placing the plant ash on the filtering layers in the porcelain filtering container, adding purified cold spring water to make the container be full of water in order to carry out dissolution and filtration, collecting filtered plant ash alkali water, removing crystal-containing turbid water at the bottom layer, pouring the plant ash alkali water into an iron pot, boiling the plant ash alkali water with strong fire until the plant ash alkali water is viscous, and stir-frying the viscous plant ash alkali water with moderate fire until a brown sugar-like solid is formed. A multiple filtering technology is adopted, and the filtering container and filtering layer substances are natural, so the filtered plant ash alkali water is all-natural and highly-pure; the purified cold spring water is adopted to carry out dissolution and filtration, so dissolution and introduction of impurities and harmful substances in the filtering layer substances into the above product at a high temperature are prevented; and the product is solid, and is convenient to transport and store.