This document proposes a deep learning-based system to detect grape leaf diseases using an improved convolutional neural network (CNN). The system aims to identify diseases in early stages by analyzing images of grape leaves. It would send timely alerts to farmers and experts to help them take necessary prevention measures. The proposed system divides the problem into modules like blurring, thresholding, mass detection and RGB to HSV color space conversion. It then uses a CNN algorithm to extract features from diseased leaf regions and predict the disease. This approach could help reduce crop damages and improve grape cultivation efficiency in India.