This study was carried out in the Experimental Farm, Faculty of Agriculture, South Valley University, Qena Governorate, Egypt during the two seasons of 2017-2018 to evaluate the effect of potassium humate and potassium silicate either alone or combined on growth and yield of tomato plants under salinity stress. Watering tomato plants with saline water i.e. 0.3, 5.5 and 9.2 dS.cm-1 significantly decreased plant height by 34.2 %, stem diameter by 8.9 %, fruit volume by 49.17 % and total fruits yield by 71.5%. Chlorophyll content of leaves significantly increased in response to salinity levels in both seasons. Seedlings root dipping and foliar spraying of potassium humate and potassium silicate did not have a potent effect on vegetative growth. Tomato plants treated with potassium humate as root dipping (300 mg L-1) and foliar spray with mixture of potassium humate and potassium silicate at rate of 250 mg L-1 for both of them during growing season increased total fruits yield under salt stress.