The invention discloses a universal metal bending robot for 90-degree bending, and belongs to the field of metal bending industrial robots. The universal metal bending robot comprises a fixed templatefor containing metal workpieces, a lifting template capable of doing the lifting movement to press the metal workpieces, a power device used for 90-degree bending of the metal workpieces, a compositepressure rod and a control system. The composite pressure rod comprises a sliding block fixedly arranged at the tail end of a synchronous connecting rod, a drive wheel arranged on the sliding block,a driven wheel which is in meshing transmission with the drive wheel, a motor B driving the drive wheel to rotate, a movable screw, a pressure application plate arranged at the lower end of a guide column, and a linear spring arranged on the guide column and located between the pressure application plate and the sliding block. The metal workpiece bending position is provided with a strain sensor.The metal bending robot for 90-degree bending is suitable for various metal workpieces and elastic springs, accurately controls the metal elasticity resilience and achieves high precision.