The invention relates to an electrocardiosignal automatic noise reduction method. The method includes the steps that 1, R-wave peak positions of electrocardiosignals are detected, and preliminary wave filtering is conducted; 2, from the electrocardiosignals after the preliminary wave filtering, cardiac beat segments of a number of continuous cardiac beats are selected, and mean-value calculation is conducted on the cardiac beat segments to obtain a mean template; 3, the mean template is used for replacing the cardiac beat segments corresponding to the obtained electrocardiosignals, and a guide signal is obtained; 4, a number of windows are set in sequence on the guide signal, then in each window, and by adopting a guide wave-filtering model, linear transformation is conducted on the guide signal to obtain wave-filtering output; 5, after linear coefficients of all window are calculated, the linear coefficients are introduced into the guide wave-filtering model, and the value of qi is obtained and serves as a final result. According to the electrocardiosignal automatic noise reduction method, by the adoption of the mean template method, a majority of amplitude features of the electrocardiosignals can be reserved to a certain degree, then, the guide signal is constructed by replacing the main parts of the electrocardiosignals, and in this way, the obtained guide signal reserves most of the amplitude features of the electrocardiosignals.