The utility model discloses an excess water drainage and pressure reduction efforescence prevention structure for stone ground bonding layer construction. The excess water drainage and pressure reduction efforescence prevention structure comprises drainage pipes (1) and joint pipe fittings; a plurality of holes are formed in the peripheral face of each drainage pipe (1); the drainage pipes (1) are connected through the joint pipe fittings to be assembled into a mesh-shaped excess water drainage structure; the joint pipe fittings comprises a cross-shaped cross tee (2), a tee (3), a 135 degree connecting piece (4) and a 90 degree connecting piece (5). According to the excess water drainage and pressure reduction efforescence prevention structure for the stone ground bonding layer construction disclosed by the utility model, by paving a specialized drainage system for section processing production in a cement mortar screed-coat, excess water in a fine stone concrete screed-coat and a cement mortar bonding layer can be drained, and water pressure caused by the negative pressure of underground water can also be reduced so as to drain the excess water, reduce the pressure and prevent stone from forming water stain, and therefore, the paving quality is guaranteed, re-doing is completely eradicated and a decorative effect is achieved.