The utility model relates to an analog quantity acquisition converter which comprises n insulation acquisition circuits, an FPGA, an FIFO and a bus driving chip. Each insulation acquisition circuit is composed of a bleeder circuit, an emitter follower, an A/D and a bus insulation chip, wherein the bleeder circuit converts a non-standard range voltage to a standard range voltage. The emitter follower performs filtering to the standard range voltage. The A/D converts the analog voltage signal to a digital signal. The bus insulation chip insulates the front end and the back end of the received digital signal. The FPGA writes the insulated digital signal to the FIFO. The FIFO stores the digital signal received from the FPGA. The bus driving chip receives an outer command for outputting the digital signal stored in the FIFO to external equipment. The converter reduces a number of the used insulation chips and a number of the used cables thereby reducing the total volume and total mass of the measuring system and improving the reliability.