针对目前广泛应用于地下流体水位观测中的投入式水位仪存在稳定性差、零漂大等缺点，研制采用智能型绝对值多圈光电编码器的浮子式数字水位仪，介绍其工作原理和仪器结构，并给出仪器性能的实验测试结果，发现其具有高分辨率、高稳定性和低零漂的特点。

Aimed at the problem of poor stability and large zero drift exists in the putting-into-type water level meter, which has been widely used in the water level observation of underground fluid, we have developed the float digital water level meter by intelligent absolute multi-turn photoelectric shaft encoder. This paper introduces its working principle and instrument structure, experimental results of instrument performance are presented.It has high resolving power, stable property and small zero drift.