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Molecular communication has been an important topic of nanotechnology. The combination of multi-nanomachines to form nano-networks is one of the main methods for practical applications. This paper proposes a transmitter positioning method for Molecular Communication via Diffusion systems with a single transmitter and multiple spherical absorption receivers. Receivers count the number of received molecules and use the Levenberg-Marquardt method to estimate the distance of the transmitter to each receiver, and then obtain the transmitter position by using a multi-point positioning method. Monte Carlo simulations are carried out to evaluate the performance of the proposed method. The simulation results show that the proposed method can accurately estimate the position of the transmitter in short to medium communication ranges.