The utility model relates to a high pressure supplies the distribution field, especially relates to a high voltage circuit breaker and spout thereof to solve spout processing and the inconvenient problem of installation that current spout adopted screw thread and flange joint to cause. For solving this technical problem, the utility model discloses a for the high voltage circuit breaker there be along axially extended opening the one end processing of spout, this opening makes the terminal formation of spout can follow radial flexible elasticity of warping and touches the finger, and elasticity is touched and is indicated to go up processing and have the flange, and processing has can be rather than joint complex recess on the flange. The axial fixity of blank is realized to opening utilize the spout when using the frock to carry out radial the fixing of blank on, prevents the axial float of blank in the course of working and then the precision of assurance processing, and the assembly time only need press elasticity touch the finger with the spout insert the flange alright realize the joint cooperation of the recess on flange and the flange on the spout, the supplementary fastening of the instrument that need not, the secondary of also having avoided consequently bringing warp and the processing design of tool operation frock.