Stainless steel fastener capable of improving connection performance

The stainless steel fastener capable of improving the connection performance comprises a fastening nail rod, a nail handle is fixedly installed at the upper end of the fastening nail rod, a torsion groove is formed in the middle of the upper end of the nail handle, tightening latch threads are formed in the peripheral side of the fastening nail rod, and built-in grooves are symmetrically formed in the lower sides of the left end and the right end of the tightening latch threads. Sliding grooves are symmetrically formed in the upper end of the built-in groove front and back, the upper and lower parts of the outer sides of the sliding grooves penetrate out of the side face of the fastening nail rod, the sliding grooves communicate with the built-in groove, and a limiting structure is arranged in the built-in groove. When the fastening nail is used, the fastening nail rod is screwed into the screw hole, the whole fastening nail rod sinks, the table top of a material limits the fixing piece, the connecting rod sl