Current type collision detection circuit and system

In order to solve a technical problem of high cost of the existing collision detection scheme, the invention provides a current type collision detection circuit and system. In the current type collision detection circuit, a current pulse connection terminal is used for receiving current pulse signals generated by a safety air bag control unit, wherein the current pulse signals comprise a first current pulse signal and a second current pulse signal; a current conversion circuit is used for converting the current pulse signals into voltage pulse signals; a first detection control circuit and a second detection control circuit are connected to the current conversion circuit, the first detection control circuit is used for generating a collision generation signal, and the second detection control circuit is used for generating a test signal; a single-chip microcomputer is used for controlling the controller to carry out collision unlocking and is also used for judging whether the current type collision detection