The invention discloses a safety protection device for digging type foundation construction. The safety protection device comprises a helmet, wherein the helmet is internally provided with an inner protecting and connecting device, a control box, a searchlight, a multi-way valve and a fan are arranged on the upper part of the helmet, a transparent arc-shaped baffle is mounted below the front of the helmet, a plurality of vertical slide chutes are arranged on the arc-shaped baffle, a support rod is arranged inside each slide chute, the end parts on the same sides of the plurality of support rods are fixed on the inner wall of the helmet, a wind door is mounted between the end parts of the other sides of the plurality of support rods, the arc-shaped baffle is arranged between the wind door and the inner wall of the helmet, the multi-way valve comprises an air inlet, an oxygen gas inlet and a wind outlet, a filter is arranged on the air inlet, the fan is mounted on the lower edge of the rear side of the helmet, the multi-way valve is mounted above the fan, and the wind outlet of the multi-way valve is communicated with the wind door through a wind channel. With the adoption of the safety protection device, the problem that when the digging type foundation construction is carried out in a deep position, a constructor can meet the danger of oxygen deficit and inhalation of particle foreign matters and harmful gas is solved, and thus multi-way comprehensive protection is provided for the safety of the constructor.