The utility model relates to the technical field of oil extraction polish rod equipment. The polish rod clamping assembly is a polish rod clamping assembly. The device comprises a shell, a rotary supporting sleeve, a clamping sleeve, a clamping pressing plate and a power telescopic device, the shell comprises a surrounding part and a bottom plate, a vertically-through mounting hole is formed in the inner wall of the surrounding part, the lower end of the surrounding part is connected with the upper end of the bottom plate, a vertically-through sleeving hole is formed in the middle of the bottom plate, and the sleeving hole and the mounting hole are both cylindrical holes and coaxially formed; the rotary supporting sleeve is sleeved with the mounting hole, a rotary channel is formed in themiddle of the rotary supporting sleeve and comprises a straight hole section and an inverted conical hole section with the wide upper portion and the narrow lower portion, and the lower end of the inverted conical hole section is connected with the upper end of the straight hole section. According to the utility model, the clamping pressing plate can realize synchronous lifting or lowering operation of each clamping petal, and the power telescopic device is arranged to control the lifting of the inner end of the clamping pressing plate in a telescopic manner, so that the switching between a clamping state and a loosening state of a polish rod is realized through the control of the power telescopic device.