The utility model provides a sewing machine controller and a sewing machine, which solve the problem that an operating part is falsely operated by certain reasons, for instance, the body of a user or the other person, or other articles is/are in contact with the operating part of the sewing machine controller. The sewing machine controller (2) installed in the sewing machine comprises an operating part (15), a locking part (12b), an unlocking part and a locking spring (8), wherein the operating part (15) moves in a specified operation direction according to the user operation so as to output a signal related to sewing; the locking part (12b) is used for specifying the locking position which limites the movement of the operating part (15) in the operation direction; the unlocking part enables the user to perform the following operations, that is, remove the lock of the locking art (12b) and enable the operating part to move in an unlocking direction different from the operation direction; and the locking spring (8) can exert an acting force to enable the operating part (15) to automatically recover to the locking position when the user operation of the operating part (15) is removed.