The invention discloses an assembly-type support of a transformer substation secondary equipment room. The assembly-type support comprises a cable control support, a screen position support, and an optical cable support. The cable control support, the screen position support, and the optical cable support are connected with an electrostatic floor. The cable control support, the screen position support, and the optical cable support are supports whose height can be adjusted. The height adjustable support comprises a base, a square steel pipe support, a nut, a bolt, and a supporting plate. The square steel pipe support is fixedly connected with the base. The nut is fixedly arranged on the upper end of a square steel pipe. The supporting plate is connected with the bolt. The bolt is connected with the nut by threads. The support is simple in structure, low in cost, and easy in installation. In control screen installation, cable laying, and floor pavement of a transformer substation secondary equipment room, the support can be rapidly and efficiently assembled on site, ensuring screen position firmness, reasonable cable path, and beautiful floor pavement, and realizes factory-like processing and modularizing laying.