The invention provides a furnace pressure detecting device for a glass melting furnace. The furnace pressure detecting device comprises an inner pressure detecting pipeline and an external pressure detecting pipeline of the melting furnace as well as a differential pressure transmitter connected with the two detecting pipelines, wherein the inner pressure detecting pipeline comprises a high-temperature pipe communicated with the inner part of the glass melting furnace, and the high-temperature pipe is horizontally or downwards arranged so that the inlet end of the high-temperature pipe is higher than the outlet end of the high-temperature pipe; the external pressure detecting pipeline comprises a receiving device for receiving an external flow of the melting furnace, the receiving device comprises a receiving pipe provided with a large-opening end and a small-opening end, the large-opening end of the receiving pipe is arranged to be closed, the small-opening end of the receiving pipe is communicated with a buffer pipe, the diameter of the receiving pipe is gradually decreased along the axis of the receiving pipe from the large-opening end to the small-opening end, the side wall of the receiving pipe is provided with a receiving hole for receiving the entry of gas, the large-opening end of the receiving pipe clings to an outer wall of the melting furnace, and a gap is preserved between the large-opening end and the outer wall. According to the furnace pressure detecting device, the inner and external pressure detecting pipelines are arranged, meanwhile, the pressure tapping accuracy of each of the pressure detecting pipelines is ensured, and thus the pressure detecting accuracy is improved.