The invention discloses an elimination method for myoelectricity artifacts in small-number-channel brain electrical signals. The elimination method includes the steps that 1, the small-number-channel brain electrical signals are decomposed at the same time with multi-element experience empirical mode decomposition, and a small-number-channel intrinsic mode component matrix is obtained; 2, the small-number-channel intrinsic mode component matrix is subjected to blind signal separation through independent variable analysis; 3, components with the myoelectricity artifacts are judged with autocorrelation coefficients, myoelectricity artifact components are subjected to zero setting, and a component matrix without the myoelectricity artifacts is obtained through independent variable analysis inverse transformation; 4, according to the marshalling sequence of the original intrinsic mode component matrix, intrinsic mode components of corresponding channels are sequentially added, and clean brain electrical signals are finally obtained. By means of the elimination method, the influence of the myoelectricity artifacts on the brain electrical signals can be completely removed, and therefore the analysis accuracy of the brain electrical signals is improved.