The invention discloses an automatic checking method for an SCD file virtual loop. Through building a virtual loop template format, and through continuous update maintenance, the validity of the SCD file is improved in two aspects of design and check. In the design aspect, the current SCD file making process still needs the artificial connection mode one by one, through building the virtual loop template, the batches of design methods can be used for selecting the corresponding templates and samples, and the making of the SCD file can be rapidly and efficiently completed. In the check aspect, the current SCD file does not perform the off-line check to virtual terminal connection, the on-site artificial check is still needed, a lot of manpower and material resources are consumed, through building the virtual loop template, the check for the validity of the SCD file virtual terminal connection can be completed by the one-button mode, the method is helpful to a designing, debugging and maintaining worker for performing the off-line check.