The invention discloses a rotating, cutting and coring device capable of rapidly digging a landmine pit in hard ground. The rotating, cutting and coring device comprises a sleeve and a mounting plate fixedly connected with the sleeve, wherein transverse cutting devices circumferentially distributed are mounted on the sleeve, the transverse cutting devices comprise linkage shafts and transverse cutting blades, the upper ends of the linkage shafts are fixedly connected with driving levers, the driving levers are hinged to electric push-pull rods, the electric push-pull rods are mounted on the mounting plate, the lower ends of the linkage shafts are fixedly connected with the transverse cutting blades, an annular saw-toothed drill bit is mounted at the lower end of the sleeve, the mounting plate is fixedly connected with a connecting drill rod, the connecting drill rod is connected with a power mechanism, and the power mechanism is fixed to a carrying plate. First, a round cut opening is formed by cutting the ground through the annular saw-toothed drill bit, then, a core body is cut through the transverse cutting blades, the core body is taken out by driving a cylinder to move through an electric lifting rod, a disguise layer and waste residues on the ground surface are perfectly kept and wholy lifted above the ground, and the basic requirement of a landmine pit digging standard is met.