The utility model relates to an engineering monitoring point device capable of being widely applied to various kinds of engineering horizontal displacement monitoring and vertical displacement monitoring. A prism monitoring point device is characterized in that a support rod and a fixing ring fixedly arranged above the support rod jointly form a prism rod, a fixing screw, a screw rod and a prism fixing ring jointly form a prism head, one end of the screw rod is inserted into the fixing ring of the prism rod, the prism head is fixed through the fixing screw, and the other end of the screw rod is connected with the prism fixing ring and is used for fixing a prism. In order to overcome the detects that the prism angle of the existing prism monitoring device cannot be regulated, the prism head can easily get lost, the common point monitoring is not ensured, and the like, the utility model provides the novel prism device, the vertical displacement observation can be carried out, the prism head angle can be freely regulated, and simultaneously, the occurrence of the lost conditions is greatly reduced through fixing the prism with the prism head and fixing the prism head with the prism rod.