The invention provides an on-state power taking structure used for taking power and having strong and weak electricity isolation features; the structure is stable and reliable in performance, and comprises a first controllable switch unit, a control unit and a transformer isolation output unit; the first controllable switch unit is used for building an electric potential difference; the control unit is for the electric potential difference; the transformer isolation output unit is used for isolating and outputting the electric potential difference; the transformer isolation output unit comprises a conversion coil, an excitation portion arranged on the input side, and a feedback part arranged on the output side thereof; a power taking module considers on-state and off-state, and can take power on both states, wherein the strong and weak electricity isolation is realized, and the performance is stable and reliable; an intelligent switch has a dual-control function, has strong and weak electricity isolation features, and is stable and reliable; a multi-bit intelligent double control switch can realize a multi-bit double control function, has strong and weak electricity isolation features, and is stable and reliable.