A computer-implemented electrical impedance imaging method, comprising: acquiring electrical impedance measurement signals of a tested human body area at a plurality of measurement times; for the electrical impedance measurement signal at each measurement time, constructing a corresponding instantaneous differential image on the basis of the electrical impedance measurement signal; constructing an image matrix on the basis of the instantaneous differential images at the plurality of measurement times, wherein each column in the image matrix is a vector corresponding to respective instantaneous differential image and wherein the image matrix is: I = a t 1, a t 2,..., a t N where I is the image matrix, a ( t 1)is a vector corresponding to the instantaneous differential image at a first measurement time, a ( t 2)is a vector corresponding to the instantaneous differential image at a second measurement time, and a ( t N) is a vector corresponding to the instantaneous differential image at an N-th measurement time calculating, on the basis of the image matrix, a covariance matrix corresponding to the image matrix by using a first predetermined computational equation, wherein the first predetermined computational equation is: C = I − I ̄ ⋅ I − I ̄ T where C is the covariance matrix, I is the image matrix, T is a transpose of the matrix, I is a time-averaged matrix with a size of M * N, and each column in the time-averaged matrix is a ̄ = 1 / N ∑ i = 1 N a t i, where M is the number of pixels in each frame of instantaneous differential images, N is the number of measurement times, and a ( t i) is a vector corresponding to the instantaneous differential image at an i-th measurement time and each element in the vector a ( t i) represents a pixel value in the instantaneous differential image; calculating, according to the covariance matrix, a weight vector of the covariance matrix by using a second predetermined computational equation, wherein the second predetermined computational equation is: w ∗ = argmax w T Cw w ∈ − 1,1 M where w * is the weight vector, w is a column vector with a size of M * 1, the value of elements in the column vector is 1 or -1, T is a transpose of the matrix, and C is the covariance matrix; and obtaining, on the basis of the covariance matrix and the weight vector, an electrical impedance state image of the tested human body area. acquiring electrical impedance measurement signals of a tested human body area at a plurality of measurement times; for the electrical impedance measurement signal at each measurement time, constructing a corresponding instantaneous differential image on the basis of the electrical impedance measurement signal; constructing an image matrix on the basis of the instantaneous differential images at the plurality of measurement times, wherein each column in the image matrix is a vector corresponding to respective instantaneous differential image and wherein the image matrix is: I = a t 1, a t 2,..., a t N where I is the image matrix, a ( t 1)is a vector corresponding to the instantaneous differential image at a first measurement time, a ( t 2)is a vector corresponding to the instantaneous differential image at a second measurement time, and a ( t N) is a vector corresponding to the instantaneous differential image at an N-th measurement time calculating, on the basis of the image matrix, a covariance matrix corresponding to the image matrix by using a first predetermined computational equation, wherein the first predetermined computational equation is: C = I − I ̄ ⋅ I − I ̄ T where C is the covariance matrix, I is the image matrix, T is a transpose of the matrix, I is a time-averaged matrix with a size of M * N, and each column in the time-averaged matrix is a ̄ = 1 / N ∑ i = 1 N a t i, where M is the number of pixels in each frame of instantaneous differential images, N is the number of measurement times, and a ( t i) is a vector corresponding to the instantaneous differential image at an i-th measurement time and each element in the vector a ( t i) represents a pixel value in the instantaneous differential image; calculating, according to the covariance matrix, a weight vector of the covariance matrix by using a second predetermined computational equation, wherein the second predetermined computational equation is: w ∗ = argmax w T Cw w ∈ − 1,1 M where w * is the weight vector, w is a column vector with a size of M * 1, the value of elements in the column vector is 1 or -1, T is a transpose of the matrix, and C is the covariance matrix; and obtaining, on the basis of the covariance matrix and the weight vector, an electrical impedance state image of the tested human body area.