1. A user biological feature authentication method, comprising: sending, by a client, an authentication request to a server; receiving, by the client, a speech password from the server; acquiring, by the client, speech information of a user to be authenticated, and acquiring a face image of the user to be authenticated in a speech information acquisition process; judging, by the client, whether the speech information is the same as the speech password or not, and judges whether the face image is valid; associating, by the client, a speech information fragment to the face image under the condition that the speech information is determined to be the same as the speech password and the face image is determined to be valid, wherein the speech information fragment is a part of the speech information acquired within a first time, the first time comprises a second time and the second time is acquisition time of the face image; calculating, by the client, a digest value of the speech password, the speech information, a target image, associated information between the target image and the speech information fragment and a first moment to obtain a first digest value by adopting a preset algorithm, wherein the target image is a face image associated with the speech information fragment and the first moment is time when the server receives the authentication request; sending, by the client, an authentication content to the server, wherein the authentication content comprises the speech information, the target image, the associated information and the first digest value; and receiving, by the client, an authentication response from the server, wherein the authentication response is a processing result, obtained by the server, of the speech password and the authentication content.