The invention relates to a speed increasing type azimuth sensor. The sensor comprises a connecting cover, a gear seat and a base, which are arranged in sequence from top to bottom, and a cross-shapedgap-eliminating gear assembly composed of upper and lower gear assemblies which are transversely arranged and a rotary shaft which is vertically arranged and is provided with an upper cover and a lower cover at two ends respectively, wherein the upper cover at the upper end of the rotary shaft is arranged in a groove formed in the outer end of the connecting cover and the lower end of the rotary shaft is arranged in a hollow shaft of an encoder in the base; the upper and lower gear assemblies are located between the connecting cover and the gear seat and outer ends of the upper and lower gearassemblies extend to the outer sides of the connecting cover, the gear seat and the base. According to the speed increasing type azimuth sensor provided by the invention, the problem of a traditionalturret azimuth sensor that the precision is relatively low is solved; the structure of the sensor is simplified, backlash errors of a gear are eliminated, transmission errors are reduced and the anglemeasurement precision is improved.