The invention provides a static cracking agent expansion pressure and temperature testing integrated device. The static cracking agent expansion pressure and temperature testing integrated device comprises supporting legs, a base, a hydraulic jack, a left stand column, a right stand column, a top seat, a guide rod, an upper fixing plate, an upper sealing piston, a pressure cell, a supporting limiting nut, a cylinder barrel and a pressure gauge; exhaust passages communicated with the interior of the cylinder barrel are arranged in the upper sealing piston and the upper fixing plate, sealing bolts are arranged at the outer ports of the exhaust passages, a mounting hole is formed in the side part of the cylinder barrel in a radial direction, and a thermometer is arranged in the mounting hole.The invention further discloses a testing method of the static cracking agent expansion pressure and temperature testing integrated device. The device can achieve the purpose of testing the expansionpressure and temperature in the hydration process of static cracking agents with different properties, is easy to carry, high in testing efficiency and testing speed and low in testing cost, can be used repeatedly, can be applied to different environments, and is suitable for testing the expansion pressure and temperature of the static cracking agents in different fast and common slow reactions.