The invention discloses an improved waterproof construction of an underground structure deformation joint. The improved waterproof construction comprises a main structure. A deformation joint is formed in the main structure, and internally provided with a waterproofing membrane, a waterproof strengthened story, an embedded steel edge rubber water stop, a pre-melting mode liquid expansion rubber water stop and a water receiver from an enclosure structure to the main structure in sequence. The deformation joint is internally provided with a base plate which is disconnected at the position of theembedded steel edge rubber water stop and the pre-melting mode liquid expansion rubber water stop; and the outer side of the base plate is provided with a PE foam rod. According to the waterproof construction, the waterproofing membrane, the waterproof strengthened story, a back type water stop, the embedded steel edge rubber water stop, the pre-melting mode liquid expansion rubber water stop, the water receiver and the like are arranged at the position of the deformation joint, so that the problem of low waterproof ability at the position of the deformation joint is solved. The improved waterproof construction of the underground structure deformation joint has the advantages of easy construction and installation, good waterproof effect and high usability.