Shale gas downhole rock stratum hydraulic fracturing method and device thereof

The invention discloses a shale gas downhole rock stratum hydraulic fracturing method and device thereof. The method comprises the following steps that S1, first-time hydraulic fracturing drilling isconducted on a stratum, a plurality of oil and gas producing cracks are formed in the stratum, the stratum with the first oil producing condition is formed, and oil and gas exploitation is started; S2, an oil shaft pre-monitoring system is established; and S3, the oil shaft pre-monitoring system is utilized to monitor the oil and gas yield in the stratum for pre-monitoring, the pressure, the oil and gas yield and the stratum temperature of the stratum with the first oil producing condition serve as indexes for pre-monitoring of the characteristics of an oil shaft, if the oil yield of the oil shaft is decreased and the oil well pressure is decreased, second-time hydraulic fracturing construction continues to be conducted on the stratum, and the stratum with the second oil producing condition is formed. According to