The invention discloses an anti-leakage one-way valve for a steam cooker. The anti-leakage one-way valve comprises a valve deck, a valve seat, a valve element, a valve element spring and a connecting joint. An anti-leakage sealing ring is arranged on the valve element, when the valve element moves upwards or downwards in a valve seat cavity, the anti-leakage sealing ring can be driven to move at the same time, when steam stops being supplied, the tapered plane of the anti-leakage sealing ring and the tapered plane of the valve seat are tightly attached, and therefore steam backflow is avoided. The anti-leakage one-way valve is good in sealing performance, low in noise and long in reuse life, meanwhile, an O-shaped sealing ring used on the anti-leakage one-way valve enables a cooker body to be easily separated from a steam cooker kitchen range body, and a user can conveniently clean and dry the cooker body.