The invention discloses a horizontal flame-proof type electric motor for a high-temperature non-leakage pump, and belongs to the field of high-temperature oils circular conveying equipment. The horizontal flame-proof type electric motor is characterized in that an oil charging cavity is arranged in a stator shell (1), a thermal insulation device is arranged between one end of a rotation shaft (18) and the stator shell (1), the outer side of the stator shell (1) is connected with an oil liquid circulation cooling mechanism (23) and a pressure regulating mechanism (3) via pipes respectively, a sealing mechanism for isolating the oil charging cavity is sleeved on the outer side of the interior of the thermal insulation device, and a heavy oil circulation channel (206) for filling heavy oil is arranged between the sealing mechanism and the thermal insulation device. The electric motor provided by the invention adopts a horizontal structure, the oil is filled into the inner cavity of the electric motor, a high-temperature conveying temperature suffered by the sealing mechanism is shared by the thermal insulation device, the heavy oil is filled into the internal portion of the thermal insulation device, good sealing is achieved via a pressure difference between the two cavities, and leakage is avoided. Pressure balance of oil in and outside the electric motor is thoroughly achieved, and thus leakage of oil liquid in the stator shell is thoroughly eradicated, conveying of the high-temperature oil liquid can be achieved, and safety and explosion suppression can also be achieved.