Monte Carlo method is one which based on the thought of probability and statistics and usually to be used to find the numerical solution of qualitative problems in mathematics, which is of great value to solve the definite integral problem. Based on the previous research, this paper focuses on the solution using the Monte Carlo method to solve triple definite integral problems by using MATLAB statements and functions. In this process, we find a method to reduce the errors after the error analysis of the results. Therefore, some suggestions are addressed to apply the Monte Carlo method reasonably in solving triple definite integral problems.