The invention provides a flange connection device and composite material electrical equipment with the flange connection device. The device is applied to the composite material electrical equipment, and comprises a connection body and at least one flange, wherein each flange is arranged on at least one end of the connection body in a sleeving manner; and the outer wall of the connection body is snapped with the inner wall of each flange. According to the flange connection device and the composite material electrical equipment with the flange connection device, as the connection body are snapped with the flanges arranged at the end parts of the connection body in the sleeving manner, relative slippage between the connection body and the flanges can be avoided; therefore, connection between the connection body and the flanges is more stable and firmer, the bearing capacity of joints of the connection body and the flanges is effectively improved, and the bending resistance and the anti-seismic property of the connection device are improved; meanwhile, by adhering connection between the connection body and the flanges, the contact area of adhering connection is enlarged, and the stability of connection body and flange connection is improved; and the flange connection device can be better suitable for the material of the connection body.