The utility model provides a polymerization facility suspends based on FPGA, including the FPGA unit, the FPGA unit is connected with the SLIC chip of a CPU and a plurality of management FXS interfaces respectively, the FPGA unit includes that one suspends a detecting element and a simulation register, whether interrupt detecting element is arranged in detecting the interrupt that comes from the SLIC chip according to the every interval time of interrupt detection parameter who disposes effective, if then will the value of the zone digit that suspend to correspond puts as 1 and write in into and simulate the register, otherwise, the zero clearing should suspend corresponding zone digit in the simulation register, the simulation register is used for the storage the interrupt identification position of SLIC chip, the FPGA unit still is arranged in receiving and comes from the interrupt of SLIC chip and be used for exporting interrupt signal to CPU when there is non zero zone digit in the simulation register. The utility model discloses realize to suspend concentrate detect, the waste of the resource that causes of polling and time one by one that reduces CPU improves the CPU response speed greatly.