安全锤，又名车窗击破器、破窗锤，是一个避险锤，配置于车辆，尤其是大型车的紧急逃生用具。其结构类似一锤子，有握把和金属锤钉，于车辆发生车祸车门无法开启时，乘员可以车窗击破器敲击车窗玻璃四个角落，再将车窗推开而逃生。有些安全锤附有切割器，让用户在安全带无法解开时切割安全带以利逃生。

公车上的安全锤经常丢失，这造成在公交车发生危险时，乘客缺少必要的逃生装置。2009年，成都6·5公交燃烧事故中安全锤的去向引发了社会舆论关注。因此有些公车的安全锤是收纳在盒内，并规定非紧急时取用视同窃取。

An emergency hammer is a safety device used in vehicles or buildings to break through window glass in an emergency.

It is a simple tool with a plastic handle and steel tips. Its primary use is for breaking through vehicle windows, which are often tempered, in the event of a crash which prevents exit through the doors. They are commonly found on public transport, in particular trains and buses and buildings. There can also be a cutting tool at the other end of the hammer. This is used for cutting through seatbelts in the event that they are inhibiting a passenger's exit.