The invention relates to a kit, in particular to a kit for soil detection. According to the kit, cylindrical reagent bottles filled with reagents with different sizes can be fixed in a clamped mode, and two soil containing grooves can be deformed out by the invention for containing the soil. A sliding groove is formed in the middle of a groove rod, wide grooves are formed in the front end and therear end of the sliding groove rod correspondingly, and the two wide grooves communicate with the sliding grooves correspondingly; two sets of movable assembling frames are arranged, the two movable assembling frames are symmetrically arranged, sliding strips are fixedly connected to the middle of the lower ends of cross seats, the sliding strips on the two movable assembling frames are connectedto the sliding grooves in a sliding mode correspondingly, the lower ends of the sliding strips are fixedly connected with limiting columns, and the lower end faces of the cross seats are attached to the upper end face of the sliding groove rod; and the upper ends of the limiting columns are tangent to the lower end face of the sliding groove rod, convex plates are fixedly connected to the left endand the right end of the upper ends of the cross seats correspondingly, the two convex plates on the cross seats are correspondingly connected with tight fastening screws I through threads, and two vertical plates are fixedly connected to the left end and the right end of the upper end faces of the cross seats correspondingly