The invention discloses a pipe extrusion mold reinforcing device convenient to install. The pipe extrusion mold reinforcing device convenient to install comprises an outer mold body. The outer end of a telescopic post is fixedly connected with outer support plates. The telescopic post can move internally and externally along a guide cylinder. A spring is arranged between the inner end of the telescopic post and the inner end of the guide cylinder. Firstly, an operator conducts pressing hard, the outer support plates and the inner support plates are inserted into the outer mold body, an inner mold body is sleeved with an installation cylinder, a fixed handle is fixed, a rotating handle is rotated, a threaded cylinder is pulled outwards, the installation cylinder is tightly squeezed, then pull wires pull outer hanging rings, the outer support plates move inwards, the spring is compressed, and then a gap is generated between the outer support plates and the outer mold body; the outer support plates and the inner support plates can be easily moved inwards, when the outer support plates and the inner support plates are moved to appropriate positions, the threaded cylinder is rotated reversely, the spring is pulled back, the outer support plates squeeze the outer mold body, the inner support plates squeeze the inner mold body, and then the supporting function is achieved; and meanwhile, one end of each pull wire is released at the position of a bearing, each pull wire can be drawn out from the other end, and the installation cylinder is detached; and therefore, use is more convenient.