The invention discloses a multi-module automatic trading system based on network distributed computing. The system comprises a historical and real-time market data processing module, a real-time market probability distribution prediction module, a trading strategy design and development module, a trading strategy history backtracking and evaluating module, a trading strategy market access and transaction management module, a system monitoring and risk control module, and a transaction report and quantitative analysis module. The automatic trading system can face various types of quantitative traders, a quantitative modeling program is simplified, a quantitative trading threshold is reduced, the quantitative strategy test and evaluation efficiency is improved, and the transaction security is guaranteed. The automatic trading system can automatically and intelligently analyze market and trading trends, provide real-time price probability distribution prediction for market main transaction products, provide a transaction signal with low delay and a high success rate for a transaction strategy and thus generate a timely and accurate trading signal, an efficient tool and comprehensive and accurate data are provided to construct the strategy of a user, and back testing and optimization are carried out.