Connecting and fixing mechanism of spray header unit and spray header unit

The invention provides a connecting and fixing mechanism of a spray head unit and the spray head unit. The connecting and fixing mechanism comprises an upward fixing mechanism and a downward fixing mechanism, the upward fixing mechanism comprises a vertical through hole formed in the spraying head, a first fixing bolt piece fixedly arranged in the vertical through hole and a first inserting hole which is formed in the bottom end of the top plate and corresponds to the vertical through hole in position; the inserting end of the first fixing bolt piece is arranged outside the vertical through hole and inserted into the first inserting hole. The downward fixing mechanism comprises a second fixing bolt piece fixedly arranged at the lower end of the barrier plate and a second inserting hole formed in the top end of the spraying head; the inserting end of the second fixing bolt piece is inserted into the second inserting hole. By means of the spray head unit, the problems that in the prior art, according to the con