The utility model discloses a support base of pole -mounted circuit -breaker and PT installation. The utility model discloses a frame erects on the bracing piece and adopts the connecting piece to connect, and outside circuit breaker setting is on the dead lever of frame, and the dead lever erects on the bracing piece for the frame can not receive too big power, makes difficult emergence of frame deform. The existence of bending segment makes the dead lever have certain limiting displacement, can prevent frame careless landing when the installation simultaneously, causes the accident. The second horizontal pole not only can be used for installing the insulator, simultaneously, has still played the effect of reinforced frame frame stability. The staple bolt is divided into two sets up when making its installation quick convenience more, makes constructor can reduce the burden that installer bore when the transport with the separately transport of two bracing pieces simultaneously when the transport bracing piece.