Water bath constant temperature oscillator, also known as water bath constant temperature shaker, adopts high-quality fully enclosed compressor with large cooling capacity. The box is equipped with fans and devices to force air convection, and the temperature distribution is more uniform. The water bath constant temperature shaker adopts the principle of electromagnetic oscillation, which is similar to the principle of induction cooker. It generates alternating magnetic field through the electronic circuit board components. The stainless steel container cuts the alternating magnetic field lines to generate alternating current. The eddy current causes iron molecules on the container wall. High-speed random movement, molecules collide and rub against each other to generate heat energy. At the same time, due to the existence of eddy current, the water molecules are acted by electromagnetic force to drive the liquid in the glass container to move, achieving the effect of vibration.