According to the semi-offline deep target tracking method based on deep learning provided by the invention, when the semi-offline deep target tracking method is used for target tracking, the problem of target tracking failure caused by false samples in online updating can be avoided, and the target tracking recognition performance can be improved. The method comprises the following steps: S1, constructing a tracker network model, and constructing a structure of a shared layer of the tracker network model based on an MDNet, wherein the specific domain layer is included and comprises a Dropout layer, a full connection layer and a classification function which are connected in sequence, and the feature map output by the last full connection layer in the sharing layer is input into a specificdomain layer after being processed by an activation function; s2, selecting a training set to obtain a trained tracker network model; and S3, obtaining a to-be-tracked feature sequence from the video,inputting the to-be-tracked feature sequence into the trained tracker network model, carrying out subsequent target tracking operation, training the specific domain layer through a sample collected on a first frame in the to-be-tracked feature sequence before the target tracking operation is started, and defining the network weight of the specific domain layer.