Electrospray ionization source device and system for mass spectrometers

The invention provides an electrospray ionization source device for mass spectrometers. The electrospray ionization source device comprises an injector, a metal capillary tube, an insulating material capillary tube and a high-voltage power supply, wherein one end of the metal capillary tube is connected with an outlet of the injector; one end of the insulating material capillary tube is connected with the other end of the metal capillary tube; and a positive electrode or a negative electrode of the high-voltage power supply is in contact with the metal capillary tube. The electrospray ionization source device is simple, limits the size of a taylor cone by adopting the capillary tubes, controls the volume of a liquid drop and generates stable spray from the perspective of an electrospray nozzle on the premise that an electrospray ionization source does not have a heating device, thereby effectively carrying out a desolvation process, improving the electrospray efficiency and lowering the detection limit of an instrument. The electrospray ionization source device for the mass spectrometers is simple in structure and relatively high in sensitivity, and can be seamlessly connected with various types of mass spectrometers.