The invention discloses a counter shaft of a viscosity meter. The counter shaft comprises a shaft body, wherein the shaft body is formed by connection of a right end first shaft, a second shaft, a third shaft, a fourth shaft, a fifth shaft, a sixth shaft and a left end seventh shaft sequentially from right to left; the right end first shaft, the second shaft, the third shaft, the fourth shaft, the fifth shaft, the sixth shaft and the left end seventh shaft are concentric, cylindrical and arranged transversely; circumferential edges of right round surfaces of the fifth shaft, the fourth shaft and the third shaft are turned into circles of chamfer angles of 45 degrees respectively; an outer circumferential edge of the first shaft is turned into a circle of outer thread, and a circumferential edge of a right round surface of the first shaft is turned into a circle of chamfer angle of 45 degrees; a first round hole, a first conical hole, a second round hole, a second conical hole, a third round hole, a third conical hole and a fourth round hole are drilled rightwards in the middle of a left round surface of the left end seventh shaft of the shaft body sequentially, are concentric and form a through hole penetrating through the right round surface of the right end first shaft of the shaft body from the left round surface of the left end seventh shaft of the shaft body; and the counter shaft of the viscosity meter is made of a steel material for shafts.