The invention discloses a control cabinet convenient to hold signboards, and relates to a power distribution control device of a power system. The control cabinet comprises a cabinet body and a cabinet door, wherein a groove is formed in a door frame of the cabinet body; the groove is internally provided with a support rack; the support rack is hinged on two side walls of the groove through a hinge pin; a support rack main body comprises a baffle block and a support block; a lower jacking wheel is arranged at the lower end of the support block; the lower jacking wheel is a cam opposite to the hinge pin; an elastic piece in match with the lower jacking wheel is arranged on the inner side of the lower end of the groove; an upper jacking wheel is arranged at the upper end of the support block; a concave jacking wheel track is arranged inside the lower end of the baffle block; a track surface of the jacking wheel track consists of a plurality sections of arched surfaces in smooth transition connection; the lower part of the upper jacking wheel is hinged with the lower end of the baffle block through a spring shaft; the upper jacking wheel is positioned inside the jacking wheel track and is in elastic match with the concave surface of the jacking wheel track; corresponding grooves are respectively formed in the inner sides of the baffle block and the support block, when being used, the grooves are taken out to form right angle lugs for support transverse signboards, and the grooves are pressed to be parallel to the surface plate of the cabinet body when not being used, thereby being convenient and attractive.