Face feature retrieval method and device and electronic equipment

The invention discloses a face feature retrieval method and device and electronic device.The method comprises the steps that after a first orthogonal matrix and a second orthogonal matrix are multiplied by a to-be-retrieved feature vector and a feature vector matrix corresponding to a base library respectively, encoding and merging are conducted, and a to-be-retrieved encoding vector corresponding to the to-be-retrieved feature vector is obtained; the method comprises the steps of obtaining a feature vector matrix corresponding to a to-be-retrieved encoding vector and a total encoding vector matrix corresponding to the feature vector matrix, then determining a first target encoding vector corresponding to the to-be-retrieved encoding vector in the total encoding vector matrix, and taking a face feature corresponding to the first target encoding vector as a retrieval result corresponding to a to-be-retrieved feature vector. Based on the method, the feature vectors are coded, so that the memory use ratio corres