The invention discloses a safety protection device for a vehicle-mounted computer, the side wall of the computer shell is fixedly connected with a plurality of telescopic rods, and the other end of the telescopic rod is fixedly connected to the side wall of the first slider, the first sliding block is slidably connected with the first sliding groove arranged on the computer protective shell, and arear end of the first slider is fixedly connected to one end of the first spring, Then, the second slider is pushed by the push rod to move, and the motion of the second slider rotates by pushing therotating plate by the first hinge rod, and the rotation of the rotating plate contacts the first moving lever by pushing the second hinge rod to contact the first moving lever and has the effect of preventing the first moving lever from moving, so as to achieve the effect of shock absorption; Therefore, the device can achieve the effect of computer protection through multi-step shock absorption.