MONITORING DEVICE

Disclosed is a monitoring device used for acquiring monitoring data of a tire, which includes a housing, the housing comprises an upper housing and a lower housing, a cavity is formed between the upper housing and the lower housing; a circuit board, the circuit board comprises a first surface which is a side of the circuit board close to the upper housing, and the circuit board is installed in the cavity; a power supply, the power supply is arranged on one side of the circuit board; and an antenna assembly, the antenna assembly includes a first antenna, the first antenna is wound on the circuit board for at least three turns, and the first antenna is used for transmitting a radio frequency signal to output the monitoring data.