The utility model relates to a long -term solid -state fertilizer injection unit suitable for gardens green seedling. The material arm one end end of executing be fixed with the metal pole, the metal pole link up rubber block, sliding block in proper order, the sliding block on be equipped with the mandrel rod, the mandrel rod horizontal position is fixed with the blade, execute and has drawn a spring between material arm one end end and the sliding block, the material arm other end end welding of executing have the fixed plate, the fixed plate passes through the bolt fastening on the walking device of agricultural tool, the utility model discloses an execute material arm one end and vertically link up in through the bearing and have the pivot, cup jointed the cushion cap dish in the pivot, cushion cap dish on be fixed with compound solid fertilizer's technological means, realized solid fertilizer's fertilizer machinery ization operation, provide whole fertilizer application efficiency.