The invention provides a device for detecting analyte in a liquid sample. The device comprises a channel, wherein one end of the channel is provided with an opening, and the other end of the channel is closed; detection reagent strips are arranged in the channel; the channel comprises a flooding prevention structure, and the cross sectional area of the channel is reduced at the position of the flooding prevention structure. The device can prevent the flooding phenomenon of the detection reagent strips, thus reducing the error rate.