The invention relates to a PVC pipeline hot melting connecting installing tool. A base is included. The top face of the base is provided with a lower clamping shell. A lower hot melting plate is arranged in the lower clamping shell. The left end of the lower clamping shell is rotationally provided with an upper clamping shell. A clamping mechanism is arranged between the lower clamping shell and the upper clamping shell. A handheld mechanism is arranged on the top face of the upper clamping shell. The upper clamping shell is internally provided with an upper hot melting plate. The upper hot melting plate and the lower hot melting plate are in butt joint into a circular shape so that the connector positions of two PVC pipelines can be subjected to hot melting. Locking mechanisms are evenlyarranged at the two ends of the upper clamping shell and the two ends of the lower clamping shell, and the locking mechanisms are used for locking the PVC pipelines. According to the provided PVC pipeline hot melting connecting installing tool, in the PVC pipeline alignment process, the locking effect is good, PVC pipeline swinging and dislocation are avoided, and the hot melting connection quality is improved.