One technical scheme of the invention is to provide a low-cost remote debugging system which is characterized by comprising a remote debugging module, a proxy server and a remote fitting module. The other technical scheme of the invention is to provide a remote debugging method based on the low-cost remote debugging system. The system and the method have the beneficial effects that bidirectional unvarnished transmission of data from an operation and maintenance center to industrial field equipment can be achieved, any operation and maintenance center can remotely debug any serial port or Internet access equipment in an industrial field, and manage the equipment in a concentrated manner in the proxy server; the system provided by the invention is simple to build, strong in universality of each module, and low in startup cost. Network resources are used as required, and a connection is only built when debugging is needed. The newly added type of the industrial field equipment can directly use the existing debugging system, with no need to customize, so that the later maintenance cost is low; according to the system, the travel cost of staffs can be reduced, and meanwhile the debugging efficiency of the industrial field can be improved. According to the system, the data of the operation and maintenance center does not need to be operated by a user in the industrial field, so thatthe security of achievements is effectively protected, and meanwhile the load of user operation in the industrial field is relieved.