Impact needle of spray head of large character code spraying machine

The invention provides an impact needle of a spray head of a large character code spraying machine. The head of the impact needle is positioned in a cavity between an upper ink fountain and a lower ink fountain; the tail of the impact needle stretches into an inductance coil and is connected with a movable core; the inductance coil drives the impact needle to move; a group of spray holes are formed in the upper ink fountain; ink can be accommodated in the cavity; and the impact needle moves to ensure that the ink is sprayed from the spray holes. The impact needle comprises a needle rod, wherein an impact block is arranged on the head of the needle rod and manufactured by forming a polytetrafluoroethylene material; a spring is arranged on the needle rod; the fixed end of the spring is connected to the needle rod; and the movable end of the spring is connected with the impact block. The impact block at the tail end of the impact needle is manufactured by forming polytetrafluoroethylene with an extremely low friction coefficient, and high mechanical property can be kept in a wide temperature range, so that the code spraying machine normally works in various environments, the maintenance cost of equipment can be reduced, and the service life is prolonged.