Novel rapid paint spraying device for interior of building metal pipeline

The invention discloses a novel rapid paint spraying device for the interior of a building metal pipeline. The novel rapid paint spraying device comprises a clamping unit and a paint spraying unit, wherein the clamping unit comprises a fixing table, and a clamping mechanism for fixing a metal pipe is arranged on the fixing table; the paint spraying unit comprises a lifting table, a linear reciprocating mechanism in the same direction as the metal pipe is arranged on the lifting table, a hard paint spraying pipe is connected to the linear reciprocating mechanism, a rotary spray head is arranged at one end of the hard paint spraying pipe, and the other end of the hard paint spraying pipe is connected with a paint supply mechanism; the hard paint spraying pipe is driven by the linear reciprocating mechanism to be pushed into the metal pipe, and paint spraying in the pipe is carried out through the rotary spray head; and after paint spraying is finished, the rotary spray head retreats from the metal pipe. The nov