Railway double-track tunnel base pressure reduction drainage system

The utility model relates to a railway double-track tunnel base pressure reduction drainage system which comprises a tunnel transverse drainage system and a tunnel longitudinal drainage system, the tunnel transverse drainage system comprises drainage side ditches arranged on the two sides of a tunnel and a plurality of transverse drainage blind pipes, and the transverse drainage blind pipes are connected with the drainage side ditches on the two sides respectively; the tunnel longitudinal drainage system comprises a central drainage ditch arranged below the middle line road surface of the tunnel, a longitudinal drainage blind ditch is arranged on the outer side of a tunnel inverted arch base under the central drainage ditch, a longitudinal drainage blind pipe is arranged in the longitudinal drainage blind ditch, and relief wells are arranged on the two sides of the longitudinal drainage blind ditch in a staggered mode. And the decompression well is connected with the longitudinal drainage blind pipe and the c