The invention discloses a multifunctional resistivity roller-compacted concrete saddle weight, comprising an upper half part and a lower half part of the saddle weight which are respectively independent or combined into a whole; the upper half part and the lower half part of the saddle weight respectively comprise a rectangular solid or cube structure, and the rectangular solid or cube structuresof the upper half part and the lower half part of the saddle weight are the same in shape and size; two handles are attached on the upper half part of the saddle weight; the upper half part of the saddle weight is also provided with four sleeve holes and four upper part resistor disc holes; and four fixation columns and four lower part resistor disc holes are arranged on the lower half part of thesaddle weight. The saddle weight disclosed by the invention has the advantages that a resistor disc can be placed into a roller-compacted concrete test piece before the test piece is molded, so thatnot only production of the roller-compacted concrete test piece is not influenced, but also the resistor disc can be accurately placed on the layer surface of roller-compacted concrete; and the saddleweight is smart, ingenious and accurate, and the difficulty that the resistor disc is more difficult to be placed into the roller-compacted concrete is solved.