The invention discloses a fast detection method for the surface enhanced Raman scattering of trace pesticide residues in oranges, and belongs to the technical field of fast pesticide detection. The fast detection method comprises the following steps: adopting acetonitrile, anhydrous magnesium sulfate and sodium chloride for mixing in a certain ratio so as to extract pesticide ingredients from the oranges as many as possible; mixing anhydrous magnesium sulfate, N-propyl ethylenediamine, C18 and graphitized carbon in a certain ratio; eliminating influences of fluorescent substances, such as organic acids, pigments, pectin and cellulose, in an extraction liquid. According to the fast detection method, the detection accuracy for the surface enhanced Raman scattering of the pesticide residues in the oranges is greatly increased, the aim of the fast detection of the trace pesticide residues is achieved, and the fast detection method basically meets the requirements of detection limit specified by the state; the fast detection method is adopted to detect the trace pesticide residues in the oranges, is simple in pre-processing of samples to be detected, fast in detection speed, low in detection cost and high in accuracy and precision, can fast and accurately analyze the trace pesticide residues in the oranges in a qualitative and quantitative manner, and can be used for on-site sample detection on a large scale.