Pluggable pin connecting assembly, crane boom and crane

The utility model provides a plug pin connecting assembly, a crane boom and a crane. The plug pin connecting assembly comprises two plug pin connecting devices, and one ends of the two plug pin connecting devices are connected in a butt joint mode. The plug pin connecting device comprises a telescopic cylinder assembly, a driving device and a connecting pin, the driving device is installed in the telescopic cylinder assembly, and the driving device is connected with the connecting pin so as to drive the connecting pin to achieve the plug action. The two plug pin connecting devices are connected in a butt joint mode, and each plug pin connecting device drives one connecting pin to conduct plug disassembly and assembly actions on the two sides of the to-be-connected piece. Meanwhile, the telescopic cylinder assembly is arranged in the plug pin connecting device, the plug pin connecting device can be suitable for to-be-connected pieces of various sizes by adjusting the length of the telescopic cylinder assembly,