Anti-falling screw assembling and disassembling tool used in narrow space

The invention provides an anti-falling screw assembling and disassembling tool used in a narrow space. Wherein, a clamping mechanism comprises a clamping mechanism handle and a clamping mechanism execution end, and a carried object fixing slider is connected with the clamping mechanism handle; a through hole allowing a screwdriver to penetrate through is formed in the middle of the carried objectfixing slider, a threaded hole allowing a fixing part to stretch into the through hole to fix the position of the screwdriver is formed in one side of the carried object fixing slider, a centering sliding groove orthogonal with the threaded through hole is formed in the other side of the carried object fixing slider, a centering adjustment part is arranged in the centering sliding groove, one endof a connecting screw pile penetrates through the centering adjustment part, and the other end of the connecting screw pile is sleeved with a torsion ring and penetrates through the clamping mechanismhandle; and the clamping m