The utility model discloses a side slope skew monitoring and forewarning device. Including base (1), be connected with the first subassembly that triggers on base (1), the first subassembly that triggers includes body (2), and the upper portion of body (2) is dome structure (17), and body (2) intussuseption is filled with insulating liquid (3), and it has floater (4) to float in insulating liquid(3), and floater (4) surface coating has conducting layer (5), and the both ends of body (2) all are equipped with a set of contact (6), and contact (6) is connected with alarm device (8). The utilitymodel has the characteristics of simple structure, convenient to use and ability real -time supervision.