Production-increasing method by water-plugging and fracturing

The invention discloses a production-increasing method by water-plugging and fracture, comprising the following steps: mixing 5 to 7 proportions of crack shielding agents with 100 proportions of clean water; injecting a mixture a into pressed cracks of a well layer under the temperature of 0 to 45 DEG C; shielding an aperture in a storage layer; mixing 5 to 10 proportions of bottom water oil reservoir plugging agent with 100 proportions of low-viscosity fracturing fluid; injecting the mixture generated in step c into cracks pressed in oil layer or gas layer under the temperature of 0 to 45 DEG C; plugging lower water layer after deposition of the mixture; carrying out sand-adding and fracturing operation on the oil layer or the gas layer at the upper part of the storage layer; closing a well and waiting for condensation then fishing the construction. In the method, the bottom water oil reservoir type or the bottom water gas reservoir type gas well bottom is plugged, the jumping-up of bottom water is prevented, simultaneously the crack height is controlled effectively, the extending-down of the crack is prevented, therefore, the aims of plugging the water layer is achieved and the single-well output of an oil well or a gas well is improved.