The invention discloses a slip prevention device. A circular ring with a certain thickness is placed on a target point to be drilled; a fixing handle is arranged at the periphery of the ring and is used for fixing the skid-off prevention device on the target working point; and the inner diameter of the ring can be changed according to the size of a drill bit. When an electric drill works, the circular ring is aligned to the working point and fixed through the fixing handle, so that the electric drill cannot slip away from the target point during working.