The invention discloses an FRP bar reinforcement concrete breast wall structure, a construction method and a formwork pouring structure. The construction method includes the following steps of installing an upstream face formwork on the upstream face side of a breast wall construction section, arranging a first layer of upstream face FPR bar netting piece and a second layer of upstream face FPR bar netting piece on the position with a certain distance to the inner face of the upstream face formwork, installing side face formworks on two sides of the upstream face formwork respectively, arranging a layer of side face FPR bar netting piece respectively on the position with a certain distance to the inner faces of the side face formworks, installing a downstream face formwork on one side opposite to the upstream face formwork, arranging a layer of downstream face FPR bar netting piece on the position with a certain distance to the inner face of the downstream face formwork, and pouring breast wall concrete in the formworks. Reinforcement steel bars are replaced by the FPR bar netting pieces in the breast wall concrete according to low density, corrosion resistance and high durability of FPR bars, and therefore the rigidity of the concrete surface is enhanced, rolled steel corrosion is prevented, and meanwhile spread of shrinkage cracks of the concrete at the initial stage is resisted.