The invention relates to an SRAM type FPGA double-port RAM single event upset prevention reinforcing device for a spacecraft, and belongs to the technical field of aerospace electronics. The single event upset prevention reinforcing device comprises a double-port RAM module and an arbitration refresher. The double-port RAM module comprises two sets of completely independent ports which are a firstport and a second port respectively, and each port comprises a data line, an address line, a read enable control line and a write enable control line. The user data is written into and read out of the double-port RAM module through the first port. The arbitration refresher reads the user data stored in the double-port RAM module through the second port and then writes the user data into the double-port RAM again under the condition that the user access data is not influenced, so that the double-port RAM is refreshed. According to the device, the problem of single event upset prevention reinforcement of the BlockRAM in the spacecraft SRAM type FPGA is solved.