The invention discloses a hardware connecting part convenient to use. The hardware connecting part comprises a main connecting rod and an auxiliary connecting rod, wherein a cavity matched with the auxiliary connecting rod is formed in the main connecting rod, fixing blocks distributed in an annular array are arranged in the cavity, limiting grooves are formed in inner side surfaces of the fixing blocks, limiting blocks fit with the limiting grooves are arranged on the outer surface of the auxiliary connecting rod, the main connecting rod sleeves the outer side of the auxiliary connecting rod and is movably connected with the auxiliary connecting rod through the limiting grooves, one end, far away from the main connecting rod, of the auxiliary connecting rod is fixedly connected with a connecting shaft, the auxiliary connecting rod penetrates through the outer wall of the connecting shaft and extends into the connecting shaft, and a positioning block is fixedly connected with one end, located in the connecting shaft, of the auxiliary connecting rod. Mechanical parts are connected by the aid of structures such as connecting blocks and internal threads, different types of parts can be connected simultaneously, dismounting is convenient, the working time can be saved, the working efficiency can be improved, and the hardware connecting part is more convenient to use.