The invention relates to a cross arm structure for reducing shock and reducing noise of a transformer. The cross arm structure comprises an upper cross arm and a lower cross arm, wherein a first horizontal through groove is formed in the upper cross arm, a second horizontal through groove is formed in the lower cross arm, the lower cross arm is arranged in the first horizontal through groove, a telescopic mechanism is arranged between the upper cross arm and the lower cross arm, a guide mechanism is arranged between the upper cross arm and the lower cross arm, a shock reduction spring sleevesthe guide mechanism, and fixed holes are formed in the upper cross arm and the lower cross arm. The cross arm structure has the advantages that shock is automatically and rapidly eliminated by the shock reduction spring which has a shock reduction and prevention principle and is arranged on the guide mechanism when shock is generated by the cross arm structure, so that the purpose of eliminating noise is achieved, and noise pollution is reduced; and with the arrangement of the guide mechanism, the stability when the shock reduction spring is compressed and resets can be ensured, the stabilityof the upper cross arm and the lower cross arm also can be ensured, and the inclination of the transformer is reduced.