An exposure parameter adjustment method, comprising: obtaining (S401; S801; S1001) a first-frame image and a first-face box, wherein the first-face box is used to indicate a region of a face in the first-frame image obtained by face detection; obtaining a face image of a second-frame image by cropping (S404; S803; S1004) the second-frame image based on a second-face box, wherein the second-frame image is a next-frame image of the first-frame image; and adjusting (S405; S804; S1005) an exposure parameter of a camera of an electronic device based on the face image of the second-frame image; wherein the second-face box is obtained (S402, S403) by correcting the first-face box, wherein a size of the second-face box is less than a size of the face box of the first-frame image, a ratio of the size of the second-face box to the size of the face box of the first-frame image is a preset proportional coefficient and a position of a center point of the second-face box is the same as a position of a center point of the face box of the first-frame image; or the second-face box is determined based on the face box of the first-frame image and a face box of a previous-frame image, wherein the face box of the previous-frame image is used to indicate a region of a face in the previous-frame image, the previous-frame image is a previous-frame image of the first-frame image, and the second-face box is an overlapping region between the face box of the first-frame image and the face box of the previous-frame image; or the second-face box is determined (S1002, S1003) based on the face box of the first-frame image and a face box of a previous-frame image, wherein an offset between a position of the face box of the first-frame image and a position of the second-face box matches a motion vector determined based on the first-frame image and a previous-frame image of the first-frame image, wherein the motion vector is determined based on a query block and a target block, the query block is any image block obtained by dividing the previous-frame image, the target block is an image block that is obtained by dividing the first-frame image and that matches the query block, a start point of the motion vector is a center point of the query block, and an end point of the motion vector is a center point of the target block. obtaining (S401; S801; S1001) a first-frame image and a first-face box, wherein the first-face box is used to indicate a region of a face in the first-frame image obtained by face detection; obtaining a face image of a second-frame image by cropping (S404; S803; S1004) the second-frame image based on a second-face box, wherein the second-frame image is a next-frame image of the first-frame image; and adjusting (S405; S804; S1005) an exposure parameter of a camera of an electronic device based on the face image of the second-frame image; wherein the second-face box is obtained (S402, S403) by correcting the first-face box, wherein a size of the second-face box is less than a size of the face box of the first-frame image, a ratio of the size of the second-face box to the size of the face box of the first-frame image is a preset proportional coefficient and a position of a center point of the second-face box is the same as a position of a center point of the face box of the first-frame image; or the second-face box is determined based on the face box of the first-frame image and a face box of a previous-frame image, wherein the face box of the previous-frame image is used to indicate a region of a face in the previous-frame image, the previous-frame image is a previous-frame image of the first-frame image, and the second-face box is an overlapping region between the face box of the first-frame image and the face box of the previous-frame image; or the second-face box is determined (S1002, S1003) based on the face box of the first-frame image and a face box of a previous-frame image, wherein an offset between a position of the face box of the first-frame image and a position of the second-face box matches a motion vector determined based on the first-frame image and a previous-frame image of the first-frame image, wherein the motion vector is determined based on a query block and a target block, the query block is any image block obtained by dividing the previous-frame image, the target block is an image block that is obtained by dividing the first-frame image and that matches the query block, a start point of the motion vector is a center point of the query block, and an end point of the motion vector is a center point of the target block.