Flow injection method for uniformly distributing reagent

The invention relates to the technical field of ocean detection, in particular to a flow injection method for uniformly distributing reagents. According to the flow injection method, a power system ofa sample adopts a pump valve with a controllable injection amount and a controllable liquid flowing direction; a power system of the reagents adopts a pump valve with a controllable injection amount;and single-time sample injection is controllable and adjustable, continuous flowing of a liquid is achieved in the whole liquid path system through continuous and repeated sample injection, the reagents are uniformly distributed in the sample during single-time sample injection, thus the consistency of the mixed solution in a measuring channel is guaranteed, and the consistency is irrelevant to the length of the measuring channel. By controlling the reagent injection time, the reagents are uniformly distributed in the sample, so that the consistency of the mixed solution in the measurement channel is ensured, the cons