Provided is a helix dynamic measurement method, comprising the steps of: 1), measuring the helix of a reference screw lever, and recording the error curve f(x) (reference) of the reference screw lever by a computer; and 2) measuring the helix of a measured screw lever, employing the reference screw lever in step 1) as a reference to install the measured screw lever and the reference screw on a same measurement device to perform comparison measurement, and recording the error curve f(x) (measured) of the measured screw lever by the computer, wherein f(x) (measured)= f(x) (reference) + f(x) (actual), and f(x) (actual)= f(x) (measured)- f(x) (reference) . The method employs the error separating technology, compensates for the system error of the reference screw lever, and improves measurement precision; meanwhile a measurement device has the characteristics of simple structure, low costs, low requirements for the environment, and convenient maintenance, and is suitable for wide popularization.