An unloading pop-up seat clamp of an oil pumping unit comprises a seat clamp body, a first lock pin, a second lock pin, a third lock pin, a first coupling pin, a second coupling pin, a third couplingpin, a safety handle, a reinforcing band and a body baffle. One side of the main body baffle plate is hinged with the seat clamp main body through a first coupling pin, a second coupling pin and a third coupling pin; a first pin hole, a second pin hole and a third pin hole are formed in the other side of the main body baffle; the seat clamp main body is provided with pin holes corresponding to thefirst pin hole, the second pin hole and the third pin hole; and the first lock pins are downwards inserted into the first pin holes and the corresponding seat clamp main body pin holes, the second lock pins are downwards inserted into the second pin holes and the corresponding seat clamp main body pin holes, and the third lock pins are downwards inserted into the third pin holes and the corresponding seat clamp main body pin holes, so that the main body baffle and the seat clamp main body are locked together. According to the utility model, the seat card can be prevented from popping up, andsafety accidents and damage to mechanical equipment can be avoided.