The invention relates to a production increase method for a deep layer shale gas reservoir. The production increase method comprises the following steps that (1) compressibility and ground stress evaluation is conducted on a stratum; (2) cluster perforation parameters are determined, and the perforation mode is circumferential perforation; (3) after crake parameters and construction parameters are determined, fracturing is conducted on target stratum shale; (4) pre-acid-fracturing treatment is conducted, and acid fracturing adopting high mucic acid and closed acidizing treatment adopting low mucic acid are included; (5) slickwater containing a propping agent is injected, and the sand-to-liquid ratio is gradually increased to be 20% from 1%; and (6) high viscosity glue liquid containing a propping agent is injected, and the sand-to-liquid ratio is gradually increased to be 23% from 5%. A deep layer shale gas well is transformed by using the production increase method, and the productive potential of the deep layer shale gas reservoir can be increased.