Equal yield density measuring method and device while drilling

The invention relates to an equal yield density measuring method and device while drilling. According to the method, annular pressure is measured while drilling, the drilling depth and the well track are tracked automatically underground, equal yield density and changes of the drilling solution are monitored in real time, and whether the equal yield density is in the range of the allowed safety window is determined, accordingly, conditions of underground pressure control, well purification, formation fluid immersion and the like can be grasped timely, drilling technicians are effectively guided, underground complex conditions and accidents are prevented, the target layers are drilled to smoothly, and anticipated drilling targets of reservoir protection and the like are achieved.