An embedded display screen and a terminal device having touch detection function, and a touch detection method are disclosed. The touch screen includes an upper substrate, a lower substrate, a liquid crystal display layer, and a common electrode. The common electrode is divided into multiple sub-electrodes arranged as a matrix to form a touch detection electrode. The driving selector is correspondingly connected with the multiple sub-electrodes one by one through multiple lead wires. The touch controller is disposed outside the upper substrate and the lower substrate, and is connected with the driving selector through selection signal line and scanning signal line. A total number of the selection signal line and the scanning signal line is less than a total number of the lead wires. The touch controller sends a selection signal to the driving selector through the selection signal line. Accordingly, the number of the lead wires is reduced.