Primer coating device

The utility model discloses a primer coating device which comprises a base, a supporting plate and a primer containing bottle, a support is arranged on the base, the lower end of the supporting plate is connected with the upper end of the support, a fixing frame used for fixing the primer containing bottle is arranged on the supporting plate, the primer containing bottle is arranged on the fixing frame in an inverted mode, and the primer containing bottle is provided with a bottle mouth. A control assembly for automatically controlling the primer liquid to flow out or stop flowing out is arranged in the bottle neck, the control assembly comprises a steel ball used for blocking the bottle neck and an elastic piece enabling the steel ball to move towards the outside of the bottle neck all the time, in the blocking state, the steel ball is clamped at the bottle neck, and part of the steel ball is exposed out of the bottle neck; when a worker needs to be stained with primer through cloth, the steel balls of the c