The invention discloses a novel degreasing and decontaminating agent and a preparation method thereof, a device comprises a main body, a mixing cavity is arranged in the top end surface of the main body, an annular driving cavity is arranged in a main seat body on the lower side of the mixing cavity, a mixing shaft is arranged rotatably and cooperatively between the annular driving cavity and themixing cavity, the mixing shaft extends into the mixing cavity, a telescopic cavity extending upward and downward is arranged in the bottom end surface of the mixing cavity, the telescopic cavity is slidably fitted with a telescopic rod, a plurality of groups of open cavities are symmetrically disposed on the left and right sides of the telescopic cavity, the open cavities are slidably fitted withmixing blades, the mixing blades extend into the mixing cavity, and are fixedly connected to the telescopic rod, a spring cavity is disposed in the top wall of the telescopic cavity, a first top pressing spring is installed between the top wall of the spring cavity and the top end surface of the telescopic rod in a top pressing cooperative manner, the mixing shaft extends into the annular drivingcavity, and a rotating table is fixed on the outer circumference.