The invention relates to a sanitary state detecting platform for a dental chair. The sanitary state detecting platform comprises handrails, power supply equipment and power conversion equipment; the handrails are arranged above the chair and used for providing places for a patient to put the two upper limbs; the power supply equipment provides electricity for various electric components of the dental chair through the adoption of 24-volt lead-acid storage batteries; the power conversion equipment is connected with the power supply equipment and used for converting the 24-volt voltage of the power supply equipment to 5-volt voltage and 3.3-volt voltage; the platform further comprises vomit concentration detection equipment which is used for detecting vomit emissions in the air in a real-time and directional mode and emitting a vomit contamination signal when the concentration of the vomit emissions is greater than or equal to a preset vomit concentration threshold. According to the sanitary state detecting platform, the sanitary state of the dental chair can be accurately and timely detected.