Aiming at the vacancy problem in the current state monitoring of the external load resultant force of the hydraulic support canopy in coal mines, a new sensor sensing method was proposed. Under the premise of monitoring the working state of the column and the balance cylinder, the influence law of different angle shear forces on the pin strain at the hinge of the top beam and the shield beam was explored. The multi-body dynamics analysis software ADAMS was used to simulate the 3D model of the two-column hydraulic support at a specific height, and the hinge force at the connecting pin of the top beam, the working resistance of the hydraulic cylinder and the external load of the top beam in the extreme load zone of the support were analyzed. At the same time, a 3D model of the force on the pin shaft was established to analyze the strain change law of the blind hole. The results show that when the external load resultant force at different bearing positions of the top beam reaches the limit level, the angle interval change rule of the support force of the pin sensor is obvious, and the shear force has a great influence on the strain change of the pin blind hole. The sensor data are easy to deduce the load state of the support top beam according to the space force balance relationship.