The invention relates to a pressure load block installing device, in particular to a manned submersible pressure load block mobile device. The manned submersible pressure load block mobile device comprises a cart body frame, a bottom plate is arranged at the side face of the bottom end of the cart body frame, a mobile platform bottom plate and a mobile platform side plate are arranged on the bottom plate, sliding rod installing bases are respectively fixed at the two sides of the mobile platform bottom plate, sliding rods are connected in the sliding rod installing bases in an inserted mode respectively, and the other ends of the sliding rods are fixed at the lower sides of the mobile platform through sliding rod sleeves; a mobile platform bearing installing base is fixedly arranged in the middle of the mobile platform bottom plate, a mobile platform sliding screw shaft is arranged in the mobile platform bearing installing base in an inserted mode, one end of the mobile platform sliding screw shaft is connected with a mobile platform operation handle, and the other end of the mobile platform sliding screw shaft is connected with a mobile platform sliding screw nut. An installing platform can be adjusted in an upper and lower, left and right and front and rear mode within a certain range, so that load block installation is finished without moving the cart body, work efficiency is high and the risk is small.