Building fire-fighting engineering spray pipe joint assembly

The invention provides a building fire engineering spray pipe joint assembly which comprises a water supply pipe, an opening and closing mechanism, a spray head and a thermal deformation plate set, a transverse cavity is formed in a transverse square pipe of the opening and closing mechanism, a transverse sliding block is sleeved with the transverse cavity, the left end and the right end of the transverse sliding block are connected with transverse rods respectively, the upper portion of the transverse square pipe is connected with an upper joint, and the lower portion of the transverse square pipe is connected with a lower joint. The upper joint is communicated with a water supply pipe, and the lower joint is communicated with the spray header; the transverse sliding block comprises a solid part and a hollow part, the solid part is used for blocking the upper connector and the lower connector, and after the transverse sliding block slides leftwards, the hollow part corresponds to the upper connector and the