The utility model discloses a movable box-type transformer substation vehicle with a horizontal transformer, relates to the field of emergency power supply or maintenance operation construction in thepower industry, and provides a movable box-type transformer substation vehicle with a horizontal transformer which can solve the problems of insufficient trafficability and parking maintenance spaceof a box-type transformer substation vehicle in a narrow road space in an urban area. The movable box-type transformer substation vehicle comprises a chassis and a carriage, wherein the carriage is divided into a carriage body I and a carriage body II by a partition plate, the carriage body I is internally provided with a cabinet body for placing the horizontal transformer, the upper part of the cabinet body is provided with a high-voltage control cabinet and a low-voltage control cabinet, the carriage body II is internally provided with a voltage regulation control box, a voltage regulation contact on the horizontal transformer is led out to be connected with the voltage regulation control box through a voltage regulation connecting cable, the voltage regulation contact is provided with an insulating protective cap, and the inner side surface of the cabinet body is provided with an insulating partition plate. According to the invention, the horizontally-arranged transformer is adopted, and the gravity center of the whole vehicle is lowered by lowering the height of the transformer; and equipment installation of the box-type transformer substation vehicle is changed from the traditional row-column installation into superimposed installation, so that the length of the whole vehicle is shorter, and the vehicle can conveniently pass through.