Flame observation port of synthetic furnace

The utility model discloses a flame observation port of a synthetic furnace, comprising a cone-shaped observation port (2), a view mirror observation port (4) and a view mirror port flange (1), the cone-shaped observation port (2) is in open connection with a wall of a furnace body (3), the view mirror port flange (1) is connected with an end part of the cone-shaped observation port (2), a view mirror is fixed on the view mirror port flange (1); the view mirror observation port (4) is arranged on a side of the cone-shaped observation port (2), an opening of the view mirror observation port (4) faces towards the view mirror on the view mirror port flange (1). 4/3 of a whole flame height can be observed through the view mirror on the view mirror observation port flange and an observation cone-shaped port, thus, the flame combustion situation can be judged, related parameters can be adjusted, a synthetic reaction can be kept in the best state, and a reaction efficiency can be guaranteed.