Passenger car back door opening assisting device

The invention discloses a passenger car back door opening assisting device which comprises a buffer block, an ejector rod, an opening assisting device base and a compression spring, after a passenger car back door is unlocked, the compression spring in the opening assisting device base releases pressure, the ejector rod is pushed, the ejector rod pushes the buffer block to jack up the back door, a gap of about 20 mm is kept between the passenger car back door and a rear bumper, and the passenger car back door is unlocked. According to the passenger car back door opening assisting device, the opening assisting handle can be conveniently touched by hands, the passenger car back door can be lifted, the hidden opening assisting handle scheme of the passenger car becomes possible, the passenger car back door opening assisting device is reasonable in structural design, high in practicability, easy and convenient to install and practical and effective in effect, and the problems that after the passenger car is unloc