Filter element assembly of fuel pre-filter

The invention relates to a filter element assembly of a fuel pre-filter. The filter element assembly of the fuel pre-filter comprises a drain pipe assembly, a filter element assembly body and a sealing device, wherein the drain pipe assembly includes a framework vertically arranged inside the filter element assembly body, a valve seat arranged at the upper portion of the framework and a drainage hole formed in the lower portion of the framework; the periphery of the framework is provided with a drainage layer; a one-way valve is arranged in the valve seat; the filter element assembly body includes an upper end cap, a lower end cap located below the upper end cap, a filter layer, a metal net and a center tube; the filter layer, the metal net and the center pipe are correspondingly and vertically arranged between the upper end cap and the lower end cap; the center pipe is located at the periphery of the drainage layer; the filter layer is located at periphery of the center pipe; the metal net is arranged inside