The invention relates to the technical field of power and warning equipment, in particular to an anti-tilting warning device, comprising a pillar and a base. The center of the base is provided with aconnection hole; one end of the pillar is fixedly connected inside the connection hole; the pillar is provided with a traction hole through which a rope or cloth is passed through and pulled out; theaxis of the traction hole is perpendicular to that of the pillar; the base is of rectangular structure. The anti-tilting warning device is characterized by also comprising four locking parts identicalin shape, four telescopic rods identical in shape, four receiving sleeves identical in shape, and four limiting sleeves identical in shape. The anti-tilting warning device has the main advantages that the concept is ingenious, the design is novel, the anti-tilting warning device is simple and easy to manufacture, low in cost and widely applicable, and the anti-tilting warning device never tilts during use.