Massage machine core

The utility model discloses a massage machine core which comprises a machine core shell, massage head assemblies, a power assembly and a transmission assembly, the power assembly is fixedly arranged in the middle of the machine core shell, the power assembly is in driving connection with the transmission assembly, the transmission assembly is in driving connection with the massage head assemblies, and the number of the massage head assemblies is two. Each group of massage head assembly comprises a double-ball massage head, a bevel disc and a rotating column, the bevel disc is rotatably connected with the double-ball massage head, the bevel disc is axially and fixedly connected with the rotating column, a fan-shaped groove and a strip-shaped groove are formed in the lower surface of the bevel disc, the strip-shaped groove is arranged in the middle, and the fan-shaped groove and the bevel disc are concentrically arranged; wherein one rotating column is fixedly provided with a first pin shaft, the first pin shaf