The electric field integration voltage measurement method has been widely studied and applied in recent years, but there are few comparative studies on the reliability of the integration algorithm. Based on D-dot electric field sensor, this paper introduces an uncertainty analysis method for transmission line voltage, evaluates the calculation method of electric field integral voltage, and studies the applicability of different algorithms. The simulation model of voltage measurement of transmission line based on electric field integration algorithm is established to calculate the transient electric field distribution under the transmission line, and the corresponding voltage values are obtained by using Gauss-Legendre and Gauss-Chebyshev methods respectively. An uncertainty analysis method is introduced to analyze the source of uncertainty of the electric field integral method, and a mathematical analysis model of the uncertainty of the electric field integral method is established to compare and analyze the uncertainty characteristics among different algorithms. An experimental platform is set up to compare the relative errors of the two electric field integration methods, and the measured performance of the Gauss-Legendre electric field integration method is better, which verifies the feasibility of the uncertainty evaluation method of the electric field integration algorithm.