Abstract: A blood physiological parameter sensing device includes a housing, a flow channel structure, a control unit and a sensing unit. The flow channel structure is disposed in the housing and forms a channel for a liquid to be measured to pass. The control unit is disposed in the housing. The sensing unit is disposed in the housing, is electrically connected to the control unit, and has a sensing end. The sensing end passes through the flow channel structure, is configured in the channel, and has an electrochemical sensing material. The electrochemical sensing material is used to exchange electrons with the blood physiological parameter in the liquid to be measured to produce redox reactions to generate current or voltage change parameters. The sensing unit transmits the current or voltage change parameters to the control unit, which obtains a blood physiological parameter concentration value to achieve instantaneous and continuous monitor the patients.