The invention discloses an expansible multi-loop inlet wire door type pole tower. The expansible multi-loop inlet wire door type pole tower comprises cross arms, pole bodies and a ground wire support, and a wire hanging plate is arranged on the cross arms. The expansible multi-loop inlet wire door type pole tower is characterized in that the two parallel pole bodies are arranged in an equal-height mode, the ground wire support is fixedly arranged at the upper ends of the pole bodies, the number of the cross arms is three, the cross arms are fixedly connected between the upper ends of two vertical pole bodies and to the outside of the upper ends of the two pole bodies through corresponding flange plates and are on the same straight line, and re-expansible flange plates are arranged at the outer ends of the cross arms on two sides. Because the cross arms can be expanded according to needs, on the premise that pole towers are not additionally arranged, multiple-loop overhead outlet or inlet wires can be achieved through cross arm expansion, engineering cost can be reduced, construction and wire outlet mode simplification are facilitated, and safe installment is achieved; when two loops of the same tower cross, external pole towers are not needed. The expansible multi-loop inlet wire door type pole tower can be widely applied to incoming and outgoing of multiple-loop wires of a transformer substation.