The invention provides a firmware security starting method and device, computing equipment and a readable storage medium, the method is applied to the computing equipment, and the computing equipment carries a common execution environment and a trusted execution environment; uEFI firmware runs in the common execution environment, at least one first calling interface is arranged in the common execution environment, and at least one second calling interface is arranged in the trusted execution environment; the method comprises the steps that when verification request information of a mirror image file is received, the verification request information of the mirror image file is transmitted to a second calling interface through a first calling interface, the verification request information is received through at least one second calling interface, the mirror image file is verified, and a verification result is obtained; and returning the verification result to the first calling interface through the second calling interface so as to execute the starting process of the UEFI firmware. According to the method and the device, the verification of the mirror image file in the trusted execution environment is realized, and the security of UEFI startup is improved.