The invention relates to the field of air valves of commercial vehicle braking systems and discloses a commercial vehicle combined type unloading valve. A filter (2) is arranged in a valve body (1), the valve body (1) comprises an upper valve main body (11) and a lower valve main body (12) which are connected in the up-down direction, and the side face of the lower valve main body (12) is provided with an air inlet connector (121), an air outlet connector (122) and an air outlet cavity (123) connected with the air outlet connector (122); a first air inlet passageway (13) is formed in the upper valve main body (11), a mounting cavity (14) penetrating through the lower end face of the upper valve main body (11) is formed in the upper end face of the upper valve main body (11), and the filter (2) is mounted in the mounting cavity (14) and comprises an upper mounting end cover (3), a molecular sieve filtering net (4) and a base (5); and a reverse blowing passageway is formed in the valve body (1) simultaneously. According to the commercial vehicle combined type unloading valve, the simple pressure relief action can be conducted, and meanwhile compressed air can be subjected to filtering and condensation water separating; and the compressed air is filtered from the interior of the filtering net to the exterior of the filtering net, and filtering accuracy is higher.