The utility model provides a dismounting device for a cross-beam-free component. Wherein the bearing main body is located below the positioning main body, the threaded connecting piece perpendicularlypenetrates through the geometric center of the positioning main body, and the tail section of the threaded connecting piece is in threaded connection with the bearing main body so as to drive the bearing main body to do reciprocating motion relative to the positioning main body. The dismounting device for the cross-beam-free component has the advantages of being convenient to mount and dismount and small in damage to concrete.