A test tube oscillator comprises a base (1), a bearing plate (2) arranged in the middle of the base, a motor (8) and a rotating disk (3). The test tube oscillator is characterized by further comprising a first crank shaft (4) and a second crank shaft (6). A first upper shaft (52) of the first crank shaft and a second upper shaft (72) of the second crank shaft are inserted into the rotating disk in a matched mode, a gap is reserved between the first upper shaft and the second upper shaft, a first lower shaft (51) of the first crank shaft and a second lower shaft (71) of the second crank shaft are inserted into the bearing plate in a matched mode, the eccentric distance between the first upper shaft and the first lower shaft is equal to the eccentric distance between the second upper shaft and the second lower shaft, and the first lower shaft is connected with a rotating shaft of the motor. The test tube oscillator is characterized in that the first crank shaft can drive the rotating disk to rotate, the rotation of the rotating disk is also restrained by the second crank shaft, and the rotating radius of any point on the rotating disk is equal to the eccentric distance between the first upper shaft and the first lower shaft. The test tube oscillator is simple in structure and low in production cost.