The invention discloses an online monitoring method for the electrolytic grinding process. The online monitoring method for the electrolytic grinding process comprises the steps that 1, electrolyte is obtained and diluted; 2, particles in the diluted electrolyte are analyzed; 3, particle features obtained through analysis are reasonably selected through a feature fusion technology, so that reasonable feature indexes are obtained for identifying the types of the particles; 4, based on fuzzy C-means and the support vector data description theory, an electrolytic grinding process evaluating model is established, and the electrolytic grinding process is monitored according to the mapping relationship between the types of the particles and the electrolytic grinding process. By the adoption of the online monitoring method for the electrolytic grinding process, the ratio parameter between the mechanical removal amount and the electrochemical removal amount in the electrolytic grinding process can be obtained, the purpose of monitoring the electrolytic grinding process on line can be achieved so that the electrolytic grinding process can be controlled on line, and therefore the online monitoring method for electrolytic grinding precision is effectively improved.