A pet indoor positioning system includes an indoor transmitter, a pet collar, and an electronic device. The indoor transmitter is used to emit a positioning wave. The pet collar includes an indoor positioning module and a communication module. The indoor positioning module is configured to receive positioning waves to obtain position information. The communication module is used to transmit location information. The electronic device is used to receive location information. The pet indoor positioning system provides a more accurate positioning function, reduces the error in pet positioning, and provides the user with instant pet position information.一種寵物室內定位系統，包含一室內發射器、一寵物項圈、及一電子裝置。室內發射器用以發射一定位電波。寵物項圈包含一室內定位模組以及一通訊模組。室內定位模組用於接收定位電波以取得位置資訊。通訊模組用於發射位置資訊。電子裝置用於接收位置資訊。寵物室內定位系統提供一種更準確的定位功能，縮小了寵物定位上的誤差，並且提供使用者即時的寵物位置資訊。
