High-voltage circuit breaker and circuit breaker connection box

The invention relates to the field of circuit breakers, in particular to a high-voltage circuit breaker and a circuit breaker connection box. The circuit breaker connection box comprises a box body, a transmission mechanism and a connection joint, the box body is provided with an arc extinguish chamber interface used for being connected with an arc extinguish chamber, and the connection joint is used for being connected with the transmission mechanism and an insulation pull rod; a guide cylinder is arranged in the box body, and the connecting joint is arranged in the guide cylinder and can move relative to the guide cylinder; one of the connecting joint and the inner wall of the guide cylinder is provided with a connecting box sealing ring, the other one is provided with a connecting box annular protrusion used for being in sealing fit with the connecting box sealing ring, and when moving and static contacts in an arc extinguish chamber connected with the connecting box are in a half-open and half-closed stat