The invention discloses a water quality evaluation method based on a continuous time neurodynamics network, and the method comprises the following steps: 1, determining an objective function and constraint conditions of a fuzzy opportunity constraint programming problem through combining a water quality evaluation problem with a given confidence level, and constructing the fuzzy opportunity constraint programming problem; 2, determining an equivalent optimization problem of the fuzzy opportunity constraint programming problem; 3, constructing a neurodynamic network with continuous time for solving the equivalent optimization problem; and 4, giving an initial state of a variable, operating a circuit according to the constructed neurodynamics network, operating the circuit to a balance state to obtain an optimal solution of an original problem, namely obtaining an optimal hyperplane equation for water quality evaluation, finally substituting test data, and outputting a water quality evaluation result according to the hyperplane equation. The water quality evaluation method based on the neurodynamics network has the continuous time characteristic and can meet the requirement for real-time solving of the water quality evaluation problem in practice.