The invention discloses a pedal regulator for a scaffold, and relates to the technical field of scaffold pedals. The pedal regulator for the scaffold comprises a transverse rod, the left end of the transverse rod is connected with a guiding rail, a sliding block is mounted on the front side face of the guiding rail, and a U-shaped sliding groove is fixed to the right end of the transverse rod. Theusing method of the pedal regulator comprises the following steps that S1, a to-be-mounted scaffold pedal is placed between the sliding block and a shell, and the sliding block is moved, so that thesliding block and the shell are located on the same straight line. The pedal regulator is convenient to mount and fix, the position of the scaffold pedal can be regulated in the horizontal direction,by stepping on the pedal on a rack, the scaffold pedal can be driven to move, operation is easy, compared with a traditional mode that a user needs to upwards and downwards climb the scaffold to regulate the pedal, the safety of scaffold pedal regulating is greatly improved, and four fixing clamps are fixedly connected with the scaffold, so that the stability during using of the scaffold pedal isimproved.