The invention relates to a method for identifying and assessing needle-like ferrite pipe line steel tissues, which comprises the following steps: simplifying various ferrite tissues into ferrite and bainite; and by a heat dyeing experiment, enabling the different tissues and crystalline grains in the material to display the different contrast from white to yellow and brown, wherein the assessing of the needle-like ferrite pipe line steel banded tissue is divided into four levels. The measuring method for the ferrite crystalline grains of the needle-like ferrite pipe line steel comprises: a comparative method and a resection method are selected for the judging method of the ferrite crystalline grains; the comparative method is used for production inspection, if dispute exists, the resection method is the arbitration method; the comparative method is as follows: judging the grain size rank by comparing with a standard rating graph; and the resection method is as follows: assessing the grain size rank by counting the measureing segment of given length and number of the points of the grain boundary resection. The invention solves the problem that practical steel rolling tissue is difficult to analyze and identify, improves the contrast difference of phase and grain of components in the tissue, is convenient for tissue identifying and pipe line steel grain size assessing, makes up the defect of the national standard, and has reasonable and feasible quality control, check and evaluation on the line steel tissue.