Reinforcing structure for reducing bias pressure of deep foundation pit and construction method

The reinforcing structure comprises an isolation pile located between a high-rise building foundation pit support structure and a deep foundation pit, the isolation pile comprises a connecting beam, a row of inclined piles and a row of straight piles, the tops of the inclined piles and the tops of the straight piles are fixedly connected with the connecting beam, and the inclined piles and the straight piles are arranged in a one-to-one correspondence mode; the inclined piles and the straight piles each comprise a pile hole, a pile pipe and a first reinforcement cage, the first reinforcement cages are located in the pile pipes, the pile pipes are located in the pile holes, first filling layers are arranged among the pile holes, the pile pipes and the first reinforcement cages, the connecting beams comprise horizontally-arranged grooves, second reinforcement cages are arranged in the grooves, and the tops of the pile pipes of the straight piles and the tops of the pile pipes of the inclined piles both stretch