Installation structure of circuit board in lockstitch sewing machine control system

The utility model provides an installation structure of a circuit board in a lockstitch sewing machine control system, and belongs to the technical field of machines. The installation structure solves the problem that an existing lockstitch sewing machine control system is large in size. The lockstitch sewing machine control system comprises a shell with an inner cavity. The installation structure comprises the circuit board and a heat dissipation aluminum sheet which are arranged in the shell. The circuit board comprises a first circuit board body and a second circuit board body, and the first circuit board body and the second circuit board body are arranged in parallel with the heat dissipation aluminum sheet, fixed to the inner side face of the heat dissipation aluminum sheet and sealed in the shell by the heat dissipation aluminum sheet. Multiple first protruding locating columns and multiple second locating columns are arranged on the inner side face of the heat dissipation aluminum sheet, both the first locating columns and the second locating columns are made of metal materials, the second locating columns are longer than the first locating columns, the first circuit board body is fixed to the first locating columns, and the second locating columns penetrate through the first circuit board body to be fixed to the second circuit board body. The installation structure has the advantages of being small in size, good in heat dissipation effect and the like.