An economical FMCW short distance measuring radar is provided and can measure the distance between a stationary or moving target and the radar. There are two implementation schemes for the radar, in afirst scheme, reception and transmission are carried out by means of one microstrip array antenna, and a circulator is added to isolate a receiving channel from a transmitting channel; and in a second scheme, reception and transmission are carried out by means of two separated antennae. The radar also comprises a microwave power divider, a balanced mixer, a voltage controlled oscillator, a modulation voltage generator, a temperature sensing controller, a synchronous time-base circuit, a reception amplifier, a demodulation filter circuit, an analog-digital converter, a digital signal processor, and a distance data output and display combination. Stability control is carried out on linear frequency modulation according to reference frequency stabilization and frequency modulation width stabilization. A demodulation filtering design scheme is led in the hardware design, and the distance measuring function is expanded. Target distance information is extracted by means of a DSP processor and fast Fourier transformation. The radar outputs target distance data and can also output a target distance distribution map in a radar beam irradiation orientation in a waveform display mode.