The utility model discloses a test mold for pre-embedding a sensor in a test piece. The die comprises a die cavity, a foot pad, a sleeve and a core rod, a hollow sleeve lower than a groove opening isarranged in the center in a hollow mold groove to be fixedly connected with the groove bottom, a core rod is matched with the sleeve to be higher than the groove opening of the mold groove, after concrete is poured into the mold groove to be subjected to surface drying, inflation and demolding are conducted from a demolding hole in the bottom of the mold groove, the core rod is taken out, and a sensor for detection is placed in the sleeve. The utility model overcomes the problems of low positioning precision, high labor intensity and inconvenience in operation due to the arrangement of a detection sensor in the original concrete test piece, and has the characteristics of simple structure, high positioning precision, low labor intensity, high molding efficiency and convenience in operation.