A pipe shell dry heat exchanger of a heat pump air conditioner comprises a shell, a copper pipe, a front end cover, a rear end cover and spoilers. A front bottom plate and a rear bottom plate are welded to the two ends of the shell correspondingly. The front bottom plate is a round plate and is welded to the front end of the shell. The inner wall face and the outer wall face of the copper pipe areboth surfaces with threads. The copper pipe serves as a medium channel to be divided into two systems. The rear end cover is welded to the rear end of the shell and is formed by welding a cylindricalshell and part of spherical surface. Each spoiler is a segment exceeding a semicircle, and the segments of the adjacent spoilers are located on the upper side and the lower side in the vertical direction correspondingly. According to the pipe shell dry heat exchanger, the shell is a thin shell, components at the front end and the rear end cannot be mounted in a bolt or flange manner, and therefore after the front bottom plate and the rear bottom plate are welded and mounted, bolt holes or flange holes can be formed in the front bottom plate and the rear bottom plate, and other components canbe mounted conveniently.