Quantitative fertilizer applicator

The utility model discloses a quantitative fertilizer applicator which comprises a storage cavity and a box body, a fertilizer storage cavity, a fertilizer inlet and a fertilizer outlet are formed in the box body, the fertilizer inlet and the fertilizer outlet are communicated with the fertilizer storage cavity, the fertilizer inlet is communicated with the storage cavity through a connecting pipe, and a fertilizer inlet sliding plate and a fertilizer outlet sliding plate which can slide relative to the box body are arranged on the box body. The fertilizer outlet sliding plate temporarily shields the fertilizer outlet, the fertilizer inlet sliding plate is located below the fertilizer inlet, the fertilizer inlet sliding plate and the fertilizer outlet sliding plate are connected, at least one of the fertilizer inlet sliding plate and the fertilizer outlet sliding plate is provided with a supporting sleeve, the upper portion of the supporting sleeve is sleeved with a sliding column, and the top of the sliding