The invention discloses a mechanical scanning meter wave radar based angle measurement method which mainly aims at solving the problem that the angle measurement of a mechanical scanning meter wave radar is low in accuracy by the traditional single pulse method. The mechanical scanning meter wave radar based method comprises step 1, dividing an antenna into two sub-matrixes equally and transmitting pulse signals; step 2, performing coherent accumulation on received echo signals and obtaining data after the accumulation; step 3, performing DET (Discrete Fourier Transformation) calculation on the data after the accumulation; step 4, finding out a point in a doppler channel, reserving M points on the left side and the right side of the point and setting rest points to be 0, wherein the point is corresponding to the doppler frequency; step 5, performing IDFT (Inverse Discrete Fourier Transform) calculation on the data which are set to be 0; step 6, obtaining a sum beam and a difference beam according to obtained two groups of data after the IDFT calculation; step 7, performing the sum and difference beam single pulse angle measurement on the sum beam and the difference beam to obtain an off-axis angle of a target; step 8, adding the off-axis angle to a reference angle to obtain the accurate angle of the target. According to the mechanical scanning meter wave radar based method for improving the single pulse angle measurement, the accuracy of the angle measurement is high, a plurality of targets can be distinguished, and the mechanical scanning meter wave radar based method can be applied to the target accurate positioning and multi-target detection of the mechanical scanning meter wave radar.