The invention provides a high-pier cable-stayed bridge zero-number block non-bracket construction method and a structure in the construction process, and relates to the field of high-pier cable-stayed bridge construction. According to the construction method, a zero-number block is divided into a plurality of sections to be poured. First, two sleeper beams are laid on a main tower cross beam, and a spandrel girder is erected on each sleeper beam; then, the spandrel girders are anchored through a rear anchoring system. Each spandrel girder is provided with a suspension system to which a suspension bottom formwork system and a side formwork system are hung. Pouring of the zero-number block is realized section by section by moving the suspension systems and the sleeper beam close to the suspension systems till construction of the whole zero-number block is completed. By the adoption of the construction method, there is no need to use an ultrahigh extra-large steel tube stand column bracket or a steel corbel bracket, there is no need to utilize stay cables, as a result, construction cost and construction requirements are lowered, and the problem that a zero-number block which is high above the ground and has ultra-long sections is difficult to construct is solved.