A voltage block device and an electrostatic coating system with the voltage block device

A voltage blocking component (26), for preventing the negative positioning side spraying material supply, comprising: Comprising a slider (120) and a switch component (40); the slider is selectively the sliding arranged between the first and second positions, and is provided with a feeding port of spraying material supply and communicates connection body (42), and an outlet port of the nozzle is connected (44); A first and second cavity (33,34) preserve (28); When the slider (120) is located at the first position time; the inlet and outlet hole (42,44) are connected with the first and second cavity (33,34) are connected; And when the slider (120) is located at the second position time; the inlet and outlet hole (42,44) and a second and first cavity (33,34) is liquid.