The utility model discloses a power station disconnecting switch operation mechanism blocking device, it includes operation means box (1), and operation means box (1) is inside to be provided with manual operating shaft (2), and the position department that corresponds manual operating shaft (2) one end on operation means box (1) lateral wall is equipped with patchhole (3), patchhole (3) outside is provided with sunshade (4), and sunshade (4) top is connected with hinge (5), and hinge (5) are connected with operation means box (1) top surface, the welding of patchhole (3) below has hasp (6), is connected with mechanical code lock (7) on hasp (6), sunshade (4) are gone up the position department that corresponds patchhole (3) and are equipped with the section of bending (8), and sunshade (4) are gone up the position department that corresponds hasp (6) and are equipped with connecting hole (9). The utility model discloses not only can prevent misuse when manual control, can also eliminate the potential safety hazard, have the effectual advantage of shutting.