The invention discloses a cross-shaped concrete torque electronic probe device and a method thereof. The device comprises a handheld electronic galvanometer, a waterproof wire and an underwater electronic probe. The handheld electronic galvanometer is connected with one end of the waterproof wire, the other end of the waterproof wire is connected with the underwater electronic probe, and the underwater electronic probe is a totally-enclosed waterproof disposable probe and comprises a probe protection cover, a hollow cup motor and a cross-shaped propeller. The hollow cup motor is arranged in the probe protection cover, and the hollow cup motor is connected with the cross-shaped propeller through a rotor shaft. When filled concrete reaches the designed elevation, namely the concrete makes contact with the cross-shaped propeller, the rotating speed of the cross-shaped propeller can be decreased quickly until the propeller gets stuck, at the moment, magnetic resistance in the motor can be decreased to be changed into electrical resistance, the total resistance value of a circuit can be lowered quickly, the voltage is constant, the current can rise rapidly, and thus the most visual alarm information can be given to constructors.