The invention discloses a quick detection method and detection kit for hydrazoate in a feed. The detection method comprises the following steps: adding standard hydrazoate into the blank substrate feed, adding distilled water, oscillating and performing still standing, and taking supernatant fluid to pass through a film; adding filtrate in a color comparison tube, adjusting pH value to be acidic, and adding a color developing reagent for color development; according to the obtained color developing photos, preparing a series of standard colorimetric cards with different hydrazoate concentrations. The detection kit comprises a plastic sample spoon, a plastic burette, a color comparison tube, a measuring tube, a test tube shelf, a 0.45-[mu]m water system filtration film, an injection syringe, pH test paper, standard colorimetric cards, a hydrochloric acid solution, an iron trichloride color developing reagent, a nitrous acid standard solution and a wash bottle. According to the invention, a test is carried out on a sample, the observed color is compared with the standard colorimetric cards for qualitative and semi-quantitative detection, if the color is straw yellow, no hydrazoate is doped in the sample; if the color is orange or sanguine, a verification test is required to be carried out; if the color remains the same, the hydrazoate is doped in the feed. The method and the kit are quick in color development reaction, not strict in measuring conditions, high in sensitivity and low in cost, and are particularly suitable for field test.