Device for controlling temperatures

The utility model discloses a device for controlling temperatures, and comprises a support. A copper tube provided with a multiplier tube inside is arranged on the support and connected with a connection block. The connection block is provided with a cooling piece. The copper is provided with a temperature sensor connected with a mainboard used for controlling temperatures by changing the duty cycle of the pulse width modulation. The device for controlling temperatures has the advantages that the mainboard changes the power the mainboard outputs to the cooling piece by changing the duty cycle of the pulse width modulation according to the temperature data transmitted from the temperature sensor, temperatures of the multiplier tube can get a good control, and accordingly temperatures are controlled.