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One method for early earthquake warning (EEW) is to detect precursors with weak energy. Detection of a weak earthquake is a challenging task due to the corruption of noisy signals. However, obtaining and annotating a large number of records are time-consuming for every region. When only a small training set is available, the traditional deep learning methods may cause over-fitting to the data. We propose to use scattering wavelet transform combined with simple classifiers (linear or SVM) to perform classification on earthquake records. The designed wavelet filters can help reduce the over-fitting of the deep neural network on a small training set. The proposed method achieves 93% classification accuracy when only 100 training samples are provided, which is much higher than the FCN and CNN method.