In order to avoid the problem that the clamping force is too large to damage the product during assembly or too small to cause slipping, a method of intelligent sensing of fiber sensing was adopted, and a load sensing system based on orthogonal fiber grating array was designed. To analyze the clamping state, the sensing modules were arranged in a way that the fiber gratings were perpendicular to each other to obtain the transverse shear force in two orthogonal directions of the clamping plane. Two 5.0cm×5.0cm rubber blocks were used to make the load sensing module in the experiment. The effect of different parameters on the clamping control was analysed, and the results show that the effective length of the fiber grating is proportional to the sensitivity and inversely proportional to the spatial resolution. The results show that the vertical sensitivity is 31.4pm/N, and the horizontal sensitivity is 29.9pm/N. It can be seen that the system can obtain the force changes of the clamped objects in real time, which is helpful for intelligent adjustment and control.