The invention discloses a strain loading system for micro-nano material multi-field joint characterization. A sample stage is fixed to the top end of a base body by spring screws, wherein piezoelectric ceramic is fixed to the upper end of the bottom of the base body, a loading stage is stuck in a metal support groove, a metal support is fixed to a groove in the right side of the sample stage by metal support screws, an electrode pressing sheet is fixed to the upper end of the sample stage, the electrode pressing sheet is in close contact with an electrode on the loading stage to form good electrical contact, a pressure head is fixed in the metal support groove, and the metal support is fixed in the top surface of the piezoelectric ceramic. Strain loading on micro-nano materials in multiple characterization devices is realized; an electrical measurement system has the characteristics of simple structure, reliable performance, simple and convenient installation, convenient operation and wide application scope, can be applied to all one-dimensional or two-dimensional nanomaterials with the length greater than 5 microns, and can be used together with instruments such as various optical microscopes, electron microscopes, spectrometers and synchronous radiometers for multi-field coupling testing.