The invention discloses a method for synchronically loading and transmitting a bipolarity power supply and 22KHz signals in coaxial network; outdoor equipment needs to use the coaxial network to transmit the power supply and satellite video system channel switching control signals in the same time; the process includes: a 22K control signal formed by a set top box and a 13V/18V bipolarity power supply are inputted in a set top box filtering shaping circuit and separated, the control signal is inputted in a comparison amplification circuit, and the 13V/18V bipolarity power supply is inputted toa power supply enhancing circuit; an amplification signal outputted by the comparison amplification circuit and a 38V/48V bipolarity power supply outputted by the power supply enhancing circuit are simultaneously inputted into a signal synchronization loading circuit; the amplification signal and the 38V/48V bipolarity power supply are synchronically loaded in the signal synchronization loading circuit, inputted into a voltage shaping circuit, and then enter the coaxial network. The existing outdoor internet communication equipment has the coaxial low band 2-path power supply signal and 22K control signal synchronization transmission problems; the method for synchronically loading and transmitting the bipolarity power supply and 22KHz signals in the coaxial network can solve said problems.