The utility model discloses a double - circuit sensor, including installing the shell on the engine main oil gallery, the shell is kept away from the one end of engine is equipped with the dustcoat, is equipped with all the circuit board that links to each other with engine ECU and whole car instrument in the dustcoat, forms first oil pocket between circuit board and the shell, is located to be connected with the load cell that is used for detecting the oil pressure on the circuit board of first oil pocket, in the shell and the one end of being close to the engine be equipped with the second oil pocket, still be equipped with the temperature measurement mechanism that extends to in the second oil pocket and be used for detecting the oil temperature on the shell, one side of being located temperature measurement mechanism is equipped with all the oil duct with first oil pocket and second oil pocket intercommunication. Adopt the double - circuit sensor of this structure, shortened the contact time of temperature measurement mechanism with fluid, improved the contact nature of temperature measurement mechanism with fluid, realized the temperature of the reaction fluid that temperature measurement mechanism can be accurate quick, guaranteed the temperature measurement effect, response time when effectively having improved the pressure measurement simultaneously.