Device for determining top dead center of engine

The invention discloses a device for determining a top dead center of an engine. The device comprises a tubular sensor base, a cylinder pressure sensor and a tubular sensor pressing sleeve. An external thread matched with a spark plug installation hole is arranged on the periphery of one end of the sensor base, a screwing part is arranged on the periphery of the other end of the sensor base, the lower portion of an inner tube cavity of the sensor base is used for installing the cylinder pressure sensor, and an internal thread is arranged on the upper portion of the inner tube cavity of the sensor base. The cylinder pressure sensor is inserted into the inner tube cavity of the sensor base. An external thread matched with the internal thread on the upper portion of the inner tube cavity of the sensor base is arranged on the periphery of one end of the sensor pressing sleeve, and the sensor pressing sleeve and the cylinder pressure sensor are closely pressed after the external thread on the sensor pressing sleev