NOVELTY - The rectangular-shaped compost grinder comprises a first movable base component that is provided with support legs and a drawer forming recovery tank and has an upper opening, a rotatable grid for closing the opening, a second peripheral component disposed on the movable base component, a third peripheral component provided with a knife and a guiding unit, and a cover equipped with an odor unit. The second peripheral component is open at its top and bottom sides. The grid is disposed on the second peripheral component and the first movable base component.    USE - The rectangular-shaped compost grinder is useful for producing a compost on a balcony, where the compost is useful as a fertilizer (claimed).    ADVANTAGE - The portable rectangular-shaped compost grinder can be easily operated, and is capable of grinding large volume of compost in an environmentally friendly manner.    DETAILED DESCRIPTION - The rectangular-shaped compost grinder comprises a first movable base component that is provided with support legs and a drawer forming recovery tank and has an upper opening, a rotatable grid designed for closing the opening, a second peripheral component disposed on the movable base component, a third peripheral component provided with a knife and a guiding unit, and a cover equipped with an odor unit. The second peripheral component is open at its top and bottom sides. The grid is disposed on the second peripheral component and the first movable base component. The cover closes an upper opening of the third peripheral component. The odor unit is a cylindrical housing comprising a filter and an odor pad. The knife is fixed on a wall of the third peripheral component actuated by an external hand-crank (26). The compost is produced by supplying vegetable wastes in element, cutting and grinding the vegetable wastes, transferring the vegetable wastes, by gravity, in the element, preserving the vegetable wastes for transferring them into the compost, transferring the drawer of the element, and withdrawing the compost. An INDEPENDENT CLAIM is included for a process for manufacturing a compost grinder.    DESCRIPTION OF DRAWING(S) - The diagram shows a third component of a compost grinder.    Third component (14)    Hand-crank (26)    Plates (29) Serration (27, 28)    Joint. (30)