The utility model provides a multifunctional automatic testing device for a cable network. The device comprises an FPGA processor, a conduction test module, a program control insulation tester, a 422transmit-receive module, a 485 transmit-receive module, an LVDS transmit-receive module and a switch matrix. Wherein the FPGA processor is a control center of the automatic test device, communicates with an upper computer through an internet access, acquires switch matrix information issued by the upper computer, and uploads cable network conduction, insulation and bus communication performance test results to the upper computer; and the FPGA processor is connected with other modules through a pin direct connection mode, an SPI bus mode and an RS232 bus mode. The utility model provides a multifunctional automatic testing device for a cable network. While the traditional cable network conduction insulation test is realized, the pseudo-random sequence generation and receiving comparison aredesigned in the FPGA to quantitatively evaluate the index of the cable network bus communication error rate, the automatic test of the bus type transceiving line communication performance in the cablenetwork is completed, and the test efficiency and the test coverage of the cable network are improved.