The embodiment of the invention relates to a simulation device for simulating the ray energy deposition of an eye crystal of a human body. The simulation device comprises a head model and an ionization chamber device, the head model is used for providing scattering particles received by the ionization chamber device in a radiation field, the head model comprises a head simulation sphere and a base, the ionization chamber device is arranged in the head simulation sphere, the ionization chamber device comprises an ionization portion, a collecting electrode and a signal transmission part, the ionization portion comprises an ionization chamber cavity and a connecting portion, the collecting electrode collects electrons generated after ionization of air in the ionization chamber cavity, the signal transmission part transmits current signals formed by the ionization portion, and the signal transmission part comprises a support rod, a rod connecting support, a fixing member, a grounding terminal, a high-voltage isolation member, a signal isolation member and a collecting electrode connecting piece. According to the simulation device, the head of an adult is simplified by the head model, the eye crystal is simulated by the ionization chamber, the dose equivalent of the eye crystal is measured, the simulation degree is high, and measured data values are more precise.