The utility model discloses a piezoelectric type self -power tyre pressure monitoring device relates to tire pressure monitoring technical field, including casing, generating set, energy conversion device, group battery, tyre pressure monitoring device, because the part in the device is all inside the casing, during the installation only need with casing fixed mounting on the outside wheel hub of tire, the mounting process has been simplified in this design, makes the installation simpler, the during operation casing provides an inclosed space for the single unit system, guarantees single unit system job stabilization nature, this device is equipped with generating set, can utilize in the vehicle motion process vibration of tire to generate electricity, for the tyre pressure monitoring device provides the power, no longer needs external power source, and it can store unnecessary electric quantity to be equipped with the group battery in this device in addition, is carved with the supply voltage when device whole can be guaranteed in this kind of design, and the tyre pressure monitoring device can be monitored the tire pressure by uninterruptedly to guarantee the integrality of monitoring data.